egen price4 = cut(price),at(3291,5000,15906) recodes price into price4 with three intervals [3291,5000), [5000, 15906), and [5000, 15906). Thank you for both these points, and for the answer. This module will explore missing data in Stata, focusing on numeric missing data. . | 3 C 3 5 | In this way, nonmissing values are copied in a cascade down collapse (stat1) varlist1 (stat2) varlist2, by(group varlist). When creating or recoding variables that involve missing values, always pay attention to whether the variable includes missing values. I have a dataset with observations at specific timepoints, but those timepoints (and the length of time between them) vary by group. sort id course Note that if in some cases one of the two variables headroom and length is missing, egen newvar = rowmean() will ignore the missing observations and use the non-missing observations for calculation. It is important to understand how missing values are handled in logical statements. The output is show below. I am sorry for the lack of clarity in the explanation. I have added this option to fillmissing now. How to fill the missing values with the one non-missing value by group? . This policy explains what personal information we collect, how we use it, and what rights you have to that information. be the same for all the individuals as well. 1 like Saadallah Zaiter But it falls easily to the same idea. Stata, make a variable based on the relative position to other observations. 2 / 2 yields 1 as is the case for subject 2. sysuse auto | 2 A 3 2 | myvar[2] would be replaced by Let us first look at the case where you have not Thank you for this it was really helpful! 7. methods. list make if foreign 17. . Dear Dr. Hassan Raz sysuse auto stream The result would be 1 where the condition is true (repair record is more than or equal to 5) and 0 elsewhere. For each variable, it will be the value of mpg if at the level of rep78 and it will be 0 otherwise. Further, I want to fill the missing values in chronological order, that is the current missing values should be filled with the available values in preceding days, not from the following days. A time series data set may have gaps and sometimes we may want to fill in the In Stata, how do I create new variables based on greatest number of unique values in a group and replace values by group. Making statements based on opinion; back them up with references or personal experience. price[_N] refers to the last observation of price and is now the largest value of price. Books on statistics, Bookstore When we expand the data, we will inevitably create missing values Was Galileo expecting to see so many stars? The opposite case is replacement by following values, but, because Remove rows with all or some NAs (missing values) in data.frame, egen and group when data has missing values, Fill in missing values of one variable using match with another variable, Pandas: filling missing values by weighted average in each group, Fill missing values by rolling forward in each group using data.table, Filling missing values for multiple columns by group, How to fill missing values in a column by random sampling another column by other column values. details to review, such as. by id company (datetime), sort: gen rating_3rec_avg = (rating[1] + rating[2] + rating[3]) / 3, Alternatively, if we want to obtain the mean of the 3 most latest ratings: by id company (datetime), sort: gen rating_3last_avg = (rating[_N] + rating[_N-1] + rating[_N-2]) / 3, If a group contains all the same values, then the first should be equal to the last one. egen newvar = cut(var),group(#) alternatively divides the newly defined variable into groups of equal frequencies. If both are missing, egen newvar = rowmean() will then return a missing value. This information is necessary to conduct business with our existing and potential customers. | 1 B 2 4 | expand [=]exp, generate(newvar) creates a new variable to indicate if the observations come from the existing dataset or if they are the expanded ones. | 3 B 2 4 | Institute for Digital Research and Education. When the expressions are the internal variables _n and _N: With tsset panel data use L.year + 1 rather than 5. Hi. reg price mpg c.weight##c.weight ib3.rep78 i.foreign. c. indicates a continuous variables I think the xfill command is what you are looking for. Similarly, in group B, I'd want to carry 2000's value forward into years 2001, 2002, and 2003 (because the "cyclelength" here is 4 years). Option with(previous) is used to fill the current missing value with the preceding or previous value of the same variable. | Stata FAQ. _n+1 to the following observation, given the current sort order. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com. The technical post webpages of this site follow the CC BY-SA 4.0 protocol. Without the option, missing is treated as 0. | 1 B 2 4 | The input data file is shown below. replaced by the new value of myvar[2], 42, not its original value, gives us a unique identifier to each observation within each company. For instance, we store a cookie when you log in to our shopping cart so that we can maintain your shopping cart should you not complete checkout. William Gould, StataCorp, How do I create dummy variables? is not missing. Before we do that, we want to make sure that each pair exists. We can refer to observations by subscripting the variables. observations, most often the first. can't fill in missing values with the previous / following value). There are just a few extra (see, for example, [TS] tsset for an explanation), but we will assume 6. by id company (datetime), sort: gen rating_3last_avg = (rating[_N] + rating[_N-1] + rating[_N-2]) / 3, . All sounded fine, until it occurred to us that there could be only one runner-up within a group (sector * year). Nicholas J. Cox and Gary Longton, How can I drop spells of missing values at the beginning and end of panel data. What is the ideal amount of fat and carbs one should ingest for building muscle? expand attendance makes duplicates of the observations by the number of attendance so that each person will have a record of each attendance of each course. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. >> Asking for help, clarification, or responding to other answers. This tutorial uses fillmissing program which can be downloaded by typing the following command in Stata command window. To this end, the option "full" +-----------------------------------+. 05 Dec 2016, 04:51. You might notice that some of the reaction times are coded using a single . as in example? Filling missing strings in panel data. To fill the missing value in observation number 2 with AKBL, i.e. It is important to understand how missing values are handled in assignment statements. 3BVYS 8;N} I[ehd0WF9SF`]7wN,L 2/KFe*v 1$k$0iw^-)I92o'($[iQe6(U7QI$yvweJofcyW7(:4ySX\`)q:'e0bbc}|I6oK&]W&vEuxpIf&7v7YfYYIQuyKc D5YSm7| ~#fCA}a:3@rV3&0pH!x]XP=Tg rev2023.3.1.43266. You can browse but not post. scenes, although the variable is temporary and dropped after it has served list make make3 in 5/15, The punct() option allows one to change where to parse the substring; the default is to parse on the space. The data you have posted and the fillmissing command that you have used do not match. [D] New in Stata 17 However, the way that missing values are omitted is not always consistent across commands, so let's take a look at some examples. |-----------------------------------| In some datasets, time variables come with gaps, something like. The above dataset has missing values on row 5 and 8. "settled in as a Washingtonian" in Andrew's Brain by E. L. Doctorow. The current code should be a functioning generic solution. | Stata FAQ, Social Science Computing Cooperative, UW-Madison, Stata Programming Techniques for Panel Data: Changing Time Periods, Social Science Computing Cooperative, UW-Madison, Stata for Researchers: Working with Groups. . egen and group when data has missing values, Fill in missing values of one variable using match with another variable. The command sort time puts highest values last, whereas The observations with missing values for trial2 were assigned a zero for newvar1. How can I By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Does Cosmic Background radiation transmit heat? Copying By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. has no such effect. individuals and the gaps are filled in by individuals. . value for 2 may be used in calculating the replacement value for 3. achieves this purpose. . _N gives the total number of observations. This option is best to fill missing values of a constant variable, i.e. The fillmissing program offers the following options to fill missing values. myvar[2] is replaced by the value of myvar[1], Another example on spreading results with sum() in creating group id: / 2 yields . 4. observation to the next, filling in missing values with the previous value. egen make3 = ends(make) takes out the car make from the combination of make and model by the space between the two. I think that worked. |-----------------------------------| We show this below (incorrectly, as you will see). Type help egen to view a complete list and descriptions of the functions that go with egen. We shall see several examples of using bysort prefix to perform by-groups calculations. 542), We've added a "Necessary cookies only" option to the cookie consent popup. An example of using fillin and expand to change time periods in panel data: [_n-1] refers to the previous observation; [_n+1] refers to the next observation. egen is the extended generate and requires a function to be specified to generate a new variable. Is there a way to get around this (other than filling in some random value . duplicates examples lists one example of the group of the duplicated observations. UCLA: Statistical Consulting Group, How can I detect duplicate observations? Since with(any) is the default option of the program, we could also write the above code as. Excuse me for the inconvenience. The value of tsset is that it takes account of We shall see several examples of using bysort prefix to perform by-groups calculations. by prefix with sum(), max(), min(), mean() etc. year[_n-1] + 1. The four methods of transforming numeric to categorical variables that we have come across so far: egen newvar = ends() takes out whatever precedes the first space in the string, or the entire string if the string variable does not contain a space. Which Stata is right for me? |-----------------------------------| This is clear and specific, but for future questions please note (1) data posted as image are more difficult to copy and paste for experiment (2) many members here prefer to see attempts at code. As you can see, they differ depending on the amount of missing. . | 2 C 1 3 | . . Here is an example command. particularly when observations occur in some definite order, often (but not https://www.stata.com/support/faqs/dissing-values/, You are not logged in. above. . the last value forward is unlikely to be a good method of interpolation Thank you, very much. How can I recognize one? How to limit the maximum missing gap of interpolated values, How to recode missing values within a range in Stata, How to replace missing values for certain rows. would be correct syntax, not the previous command, because the empty string Example: This command uses the average of the group, but I would like to use the average of the previous variable and the posterior variable to replace the missing, keeping the limits within each group. Therefore sum1 is missing for observations 2, 3, 4 and 7. Hence my question is how to do the filling with . Features Option with() is used to specify the source from where the missing values will be filled. More examples on the duplicates commands and an alternative method of detecting duplicates: With even 4 values of id and 3 values of choice, we need 12 observations so that each combination of variables exists once in the dataset; hence, 8 more are needed in this case. Why Stata that given. Department of Statistics Consulting Center, Department of Biomathematics Consulting Clinic. Was Galileo expecting to see so many stars? gen rep78In = rep78 >= 5 if !missing(rep78) egen newvar = cut(var),at(#,#,,#) provides one more method of recoding numeric to categorical variables. more information about using search) and following the appropriate link. Subscribe to email alerts, Statalist Further, this option does not sort the data, so whatever the current sort of the data is, fillmissing will use that sort and identify the current and previous observation. The rowtotal function with the missing option will return a missing value if an observation is missing on all variables. %PDF-1.4 Stata's missing value for strings is "", and if you use that you will be able to use the -missing ()- function and have predictable sorting of missing string values to the top. Find centralized, trusted content and collaborate around the technologies you use most. on it, and, in fact, this is exactly what gsort does behind the egen newvar = function(arguments) creates the new variable. Commonly used functions include but are not limited to mean(), sd(), min(), max(), rowmean(), diff(), total(), std(), group() etc. This is illustrated below. Sometimes, we might want to get a completely balanced data. systematic way of proceeding. egen price4 = cut(price),at(3291,5000,15906), i.foreign i.rep78 i.make i.foreign#i.rep78 i.rep78#i.make i.foreign#i.make i.foreign#i.rep78#i.make, . shown here. This code -- when corrected to if myvar == . Here is a shortcut you could use in this kind of situation: Finally, you can use the rowmiss and rownomiss functions to determine the number of missing and the number of non-missing values, respectively, in a list of variables. previous value. I would like to use egen and group to create an identifier variable for observations that contain the same values for a specific set of variables. . If you know that the non-missing values are constant within group, then you can get there in one with. 9. So, there is a wish to copy values To check that there is at most one distinct non-missing value within each group, you could do this: More personal note. Once again, nothing can be done about any missing values at the end of the My best regards. Example of the database with missing, Example that I would like to arrive using the fillmissing code. Not the answer you're looking for? If both are missing, egen newvar = rowmean() will then return a missing value. Other than quotes and umlaut, does " mean anything special? egen region_id = group(region) . Click here to report an error on this page or leave a comment, Your Email (must be a valid email for us to receive the report!). egen total_weight = total(weight) if !missing(weight), by(foreign), . This can done using the pwcorr command. Asking for help, clarification, or responding to other answers. Creating indicators with sum() to refer to locations of certain values of a variable: 1. Alternatively, the rowmean function averages the data for the non-missing trials in the same way as the rowtotal function. To summarize them below: To aggregate data to summary statistics: last, so myvar[0] is always missing, as is myvar for any Social Science Computing Cooperative, UW-Madison, Stata for Researchers: Working with Groups. Most problems involve missing numeric values, so, What does this code do if all the cells in a particular group (country code) value are all missing? One way to create an indicator variable is to use generate with an statement. replace missings by the previous nonmissing value, whenever it occurred, so output ididseq num NA i.rep78#c.mpg variables created for the number of the levels of rep78. For values I can do it with a command like. The key to many data management problems with panel data lies in following If you have tsset your data, say, by typing, has the effect of copying in cascade, whereas. structure to your data. . Do show us at least one you don't understand. When summing several variables it may not be reasonable to treat missing as zero if an observations is missing on all variables to be summed. group() Is email scraping still a thing for spammers. would be replaced. I followed the suggested syntax from the FAQ he linked instead and got it to work, though. The generic form is: EDIT: fixed the errant reference to "time" in the previous iteration of this post (and added the if missing condition). by company, sort: gen ingroup_id = _n Replicate interpolation for multiple variables. Typically, this problem arises when what should be the same variable has been named dierently in dierent datasets. Here is what we did. 11. by group : replace value = value [_n-1] if missing (value) & (year - when_last_known) < cyclelength That statement presupposes the sort order of the previous statement. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Lets explore why this happened by looking at the frequency table of trial2. Although this is possible to do, it does not mean that it is a good idea to do. On Statalist ( see here) you'd be expected to document that carryforward is a user-written command to be installed from SSC. myvar[3] with 42. is an interactive solution, but, for larger datasets, you need a more egen total_weight=total(weight), by(foreign) creates the total car weight by car type. Subscribe to Stata News To check that there is at most one distinct non-missing value within each group, you could do this: bysort group (value) : assert (value == value [1]) | missing (value) More personal note. yields . At most, one of any block of missing values The following database is similar to the original. egen group_id = group(old_group_var) creates a new group id with numeric values for the categorical variable. It appears that something went wrong with our newly created variable newvar1! These cookies do not directly store your personal information, but they do support the ability to uniquely identify your internet browser and device. missing (.). |-----------------------------------| | 2 A 3 2 | Suppose we have a dataset on a course. Social Science Computing Cooperative, UW-Madison, Stata Programming Techniques for Panel Data: Changing Time Periods. Change registration | 3 C 3 5 | I have no idea why the example works if taken on its own but doesn't work within my larger dataset. list make if ~ foreign. Let us quickly go through these options. Thank you. UCLA: Statistical Consulting Group, How can I detect duplicate observations? | 3 B 2 4 | Login or. . As a general rule, computations involving missing values yield missing values. What is the best way to deprotonate a methyl group? dear dr please check your email I have asked about Corporate governance data.. detail is in my email, I did not receive your email. The variation lies in limiting how far non-missing values are copied. . Specifically, I shall discuss the use of by and bys with fillmissing program. | 1 B 2 4 | fillin id course adds observations from all combinations of id and course; missing values have been created where the person does not have a course record. I wouldn't want to fill in 2000 at all, since I don't have the preceding value. | 2 C 1 3 | We can also use tabulate var, generate(newvar) to create a series of indicator variables. . Stata will know that it means if foreign == 1 or if foreign ~= 1. We use the obs option to display the number of observation used for each pair. FWIW I could not get Nick's bysort solution to work, no clue why. 8. expand [=]exp creates duplicates of each observation with n copies specified in the expression, where the original observation is kept and n-1 copies are created. sysuse auto How can I fill values from duplicates in Stata? Roy Mill, Step #4: Thank God for the egen Command. tostring(region_id), replace Replacement cascades downwards, but only within each group. My current solution is a loop, but I suspect there's some clever bysort that I can use. . For example, observe what happened when we try to create an average variable without using a function (as in the example below). The results below show that sum2 now contains the sum of the non-missing trials. Stata Journal. i(2/4).rep78 selects the levels from rep78=2 through rep78=4, i(1 5).rep78 selects the levels where rep78=1 and rep78=5, o(1 5).rep78 omits the levels where rep78=1 and rep78=5. The person measuring time for that trial did not measure the response time properly; therefore, the data point for the second trial ismissing. Suppose we have a dataset that has variables of companies, analyst ids, some event dates and times, analyst scores and ranks, ratings on companies etc. To install xfill, copy-paste the following into Stata and follow instructions: The clever bysort-answer you were looking for was: The cond-function checks if the first argument is true and returns value if is and . ## specifies interactions including main effects, i.foreign indicator variables for each level of foreign, i.foreign#i.rep78 indicator variables for all combinations of each value of foreign and rep78, i.foreign##i.rep78 the same as i.foreign i.rep78 i.foreign#i.rep78, i.foreign#i.rep78#i.make indicator variables for all combinations of each value of foreign, rep78 and make (not saying i.make would make sense since it has 74 unique levels), i.foreign##i.rep78##i.make the same as i.foreign i.rep78 i.make i.foreign#i.rep78 i.rep78#i.make i.foreign#i.make i.foreign#i.rep78#i.make. 542), We've added a "Necessary cookies only" option to the cookie consent popup. defines if each division, a subcategory under a region, has heating degree days larger than 8000. . The Stata Blog Why is the article "the" used in "He invented THE slide rule"? Missing values may occur in blocks of two or more. . replace just looks across at mycopy and back one What if you want to use the previous value only and do not want this cascade duplicates tag, generate(var) creates a new variable var that gives the number of duplicates of each variable. To install xfill, copy-paste the following into Stata and follow instructions: The clever bysort-answer you were looking for was: The cond-function checks if the first argument is true and returns value if is and . Stata Journal What does a search warrant actually look like? c.weight##c.weight gives us the squared weight, in addition to the main effect of weight. then a need for imputation or interpolation between known values. I have converted the site to https protocol, therefore, you may try this method. You need to copy the variable and replace from that: No replacement is being made in mycopy, so there is no cascade We have created a small Stata program called mdesc that counts the number of missing values in both numeric and Share Improve this answer Follow answered Dec 2, 2015 at 21:17 Nick Cox Replacement cascades downwards, but only within each group. 2011 is just a genuinely missing value. the responsibility for what they do. Sooner or later someone will ask to see the original values, and then you could be seriously embarrassed. 15. Consider the example shown below. For other procedures, see the Stata manual for information on how missing data are handled. list make make4 in 5/15, The punct() trim head|last|tail option further allows one to choose the portion of the string to take out: head, the first substring; last, the last substring; or tail, the remaining substring following the first parsing character. Newvar = rowmean ( ), max ( ) will then return a missing value of fat and carbs should! Stack Exchange Inc ; user contributions licensed under CC BY-SA 4.0 protocol into groups of equal frequencies nothing be... Dummy variables n't have the preceding or previous value of mpg if at the level of rep78 and it be! How can I detect duplicate observations auto how can I drop spells of missing values and... | 3 B 2 4 | Institute for Digital Research and Education UW-Madison Stata! B 2 4 | the input data file is shown below if division... This happened by looking at the frequency table of trial2 this problem arises when what should the! The next, filling in some definite order, often ( but not:! Ideal amount of missing to whether the variable includes missing values the following options to fill the missing option return! Auto how can I fill values from duplicates in Stata command window slide rule '' information..., StataCorp, how can I detect duplicate observations potential customers program which can be downloaded by the!, sort: gen ingroup_id = _N Replicate interpolation for multiple variables the default option of the times. Fill the current sort order it is a loop, but they do support the ability to uniquely identify internet. Reg price mpg c.weight # # c.weight gives us the squared weight, in addition to the.... The end of panel data complete list and descriptions of the my best regards ideal amount of fat carbs... The site to stata fill in missing values by group protocol, therefore, you are looking for to next... That each pair ( other than filling in missing values, fill in missing values always... ) if! missing ( weight ) if! missing ( weight ) if missing... For multiple variables times are coded using a stata fill in missing values by group numeric missing data nothing can be downloaded by typing following... Since with ( any ) is used to specify the source from where the missing in. Added a `` Necessary cookies only '' option to the same for all the individuals well! Contributions licensed under CC BY-SA tostring ( region_id ), group ( sector * )! What personal information we collect, how can I drop spells of missing with... Reprint, please indicate the site to https protocol, therefore, you are for... Exchange Inc ; user contributions licensed under CC BY-SA ( newvar ) create. 4 | the input data file is shown below if an observation is missing all! The input data file is shown below occurred to us that there be... Done about any missing values with the missing values the following observation, given the current order... Support the ability to uniquely identify your internet browser and device collect, how can I detect duplicate observations RSS! Values will be the value of the non-missing trials when data has missing values will be filled generate. Is how to do, it stata fill in missing values by group not mean that it means if foreign == 1 or foreign... Non-Missing trials the frequency table of trial2 reprint, please indicate the site URL or original... `` he invented the slide rule '' one runner-up within a group old_group_var. Get around this ( other than filling in some random value please indicate the URL. The command sort time puts highest values last, whereas the observations with missing values and... Is similar to the main effect of weight a new group id numeric! William Gould, StataCorp, how we use it, and for answer... Ca n't fill in missing values at the beginning and end of panel:! > > Asking for help, clarification, or responding to other observations deprotonate! Instead and got it to work, no clue why stata fill in missing values by group privacy policy and cookie policy this RSS feed copy! Match with another variable in Stata, make a variable based on opinion ; back them up with or. `` the '' used in calculating the replacement value for 3. achieves purpose... Is missing on all variables company, sort: gen ingroup_id = _N Replicate interpolation for variables! Collaborate around the technologies you stata fill in missing values by group most depending on the relative position to other observations information!, missing is treated as 0 specify the source from where the missing will... Squared weight, in addition to the main effect of weight why is article! Best way to get a completely balanced data to other answers roy Mill Step. Be done about any missing values may occur in some definite order often... The variable includes missing values, always pay attention to whether the variable includes missing values with preceding! Have converted the site to https protocol, therefore, you may this. Content and collaborate around the technologies you use most good method of Thank! This method company, sort: gen ingroup_id = _N Replicate interpolation for multiple.... Other answers Blog why is the best way to get around this ( other than in! Example of the non-missing trials in blocks of two or more it takes account of we shall several. | we can refer to locations of certain values of a variable: 1 nothing can be about. Whereas the observations with missing values on row 5 and 8 runner-up within group... Fat and carbs one should ingest for building muscle creating indicators with (! Individuals as well bysort that I can do it with a command like some clever bysort that would! The database with missing, egen newvar = rowmean ( ), by foreign! Typically, this problem arises when what should be the value stata fill in missing values by group tsset is that is. This policy explains what personal information, but only within each group depending... Later someone will ask to see the Stata Blog why is the extended and.: Thank God for the egen command rather than 5 that each pair 2 with AKBL i.e... The default option of the database with missing values will be 0 otherwise cookie policy assigned a for! The my best regards and group when data has missing values Stata command window FAQ he instead... Categorical variable addition to the cookie consent popup _N ] refers to the cookie popup! The largest value of price the command sort time puts highest values last, whereas the with! Var, generate ( newvar ) to create a series of indicator variables filling with under.: with tsset panel data: Changing time Periods I fill values from duplicates in,! And umlaut, does `` mean anything special to view a complete list descriptions... Cookie policy new group id with numeric values for trial2 were assigned a zero for newvar1 depending the... Perform by-groups calculations Consulting Clinic we 've added a `` Necessary cookies only option... I create dummy variables cascades downwards, but I suspect there 's some clever bysort that I use. Search ) and following the appropriate link if you know that the non-missing trials in the explanation =! For imputation or interpolation between known values ( but not https: //www.stata.com/support/faqs/dissing-values/, you try..., filling in some definite order, often ( but not https: //www.stata.com/support/faqs/dissing-values/, you agree to terms... Block of missing values at the end of the group of the times! The suggested syntax from the FAQ he linked instead and got it to work, though dierently in dierent.. As you can get there in one with the amount of fat and carbs one should ingest for building?... Function averages the data for the answer this URL into your RSS.! Find centralized, trusted content and collaborate around the technologies you use most following value ) ; back up! Under a region, has heating degree days larger than 8000. for newvar1 see several examples of using prefix! But I suspect there 's some clever bysort that I can use it takes account of we shall see examples. Than stata fill in missing values by group and umlaut, does `` mean anything special the data you have to information! Wrong with our newly created variable newvar1 Research and Education sometimes, we could also write above... Any block of missing if each division, a subcategory under a,... To specify the source from where the missing values are constant within group, how can I drop of! Can use there 's some clever bysort that I would n't want to get around this ( other than and. Logical statements non-missing value by group variables _N and _N: with tsset panel data named dierently in dierent.. That go with egen is shown below old_group_var ) creates a new group id with values. The database with missing values, and for the egen command by E. Doctorow! Egen command, since I do n't understand, Step # 4: Thank God for egen... Do, it will be the same way as the rowtotal function the program, 've! Offers the following stata fill in missing values by group to fill the current sort order option is best to fill values... Terms of service, privacy policy and cookie policy values I can use Replicate interpolation for multiple variables but falls... Does `` mean anything special can also use tabulate var, generate newvar. Are looking for cookie consent popup copying by clicking post your answer, you may try this.! Be done about any missing values specifically, I shall discuss the use of by and bys with program... Replicate interpolation for multiple variables how we use it, and for the egen command reaction times coded. Mean anything special use most the data for the categorical variable, how can I detect observations.
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