How to delete #duplicates #repeated observations from #stata dataset. How to delete #duplicates #repeated observations from #stata dataset.

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Nicholas J. Cox & Thomas Steichen, 1997. "DUPS: Stata module to identify and optionally remove duplicate observations," Statistical Software Components S322901, Boston College Department of Economics, revised 23 Sep 2001. Handle: RePEc:boc:bocode:s322901 Note: This module may be installed from within Stata by typing "ssc install dups".

since for clarity I used simple numbers rather than Stata … 2019-02-11 /* find and remove duplicates within year */ by year b, sort: gen i=_n keep if i==1 drop i tempfile temp1 save `temp1', replace /* create all possible pairs using joinby */ rename b c /* rename prior to joinby */ rename bx cx /* rename prior to joinby */ joinby year using `temp1' drop if b==c /* drop if b and c are the same */ egen d1=concat(b c) /* create joint pairs in order 1 */ egen d2 duplicates tag generates a variable representing the number of duplicates for each observation. This will be 0 for all unique observations. duplicates drop drops all but the first occurrence of each group of duplicated observations. You can try with group by: select Firstname , Lastname , case when count(*) > 1 then '**ERROR**' else age end from Table group by Firstname , Lastname , age; Or in case you want to return all rows with duplicates: select t.Firstname , t.Lastname , case when (select count(*) In Stata, several programs are available to detect the duplicates and can also optionally drop the duplicates. One of the programs is called dups .

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For group id =3, keep observation 1 (because it has only 1 obs) For group id =4, keep observation 1 (or any of them but one obs) I am trying Stata duplicates command, duplicates tag id if disease==0, generate (info) drop if info==1 Without any argument, dups returns information on the number of groups of observations that have duplicates and the number of duplicates in each group. In our example, we have one group of observations with duplicates consisting of observation number 1, 7 and 8. That is what we see below.

Nicholas J. Cox & Thomas Steichen, 1997. "DUPS: Stata module to identify and optionally remove duplicate observations," Statistical Software Components S322901, Boston College Department of Economics, revised 23 Sep 2001. Handle: RePEc:boc:bocode:s322901 Note: This module may be installed from within Stata by typing "ssc install dups".

Stata tag duplicates within group

isid x1 x2 x3; The duplicates command can list and flag duplicate observations. The list subcommand lists the duplicate observations: .

Stata tag duplicates within group

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duplicates tag generates a variable representing the number of duplicates for each observation. This will be 0 for all unique observations. duplicates drop drops all but the first occurrence of each group of duplicated observations.

Currently I have been tasked with creating a program that will list out errors in our data set to facilitate cleaning. One key problem I am hung up on is finding a way to list out duplicates within multiple levels of another variable. duplicates tag generates a variable representing the number of duplicates for each observation.

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