# [PDF] duplicates, stata.com duplicates — Report, tag, or drop duplicate observations. Title stata.com isid — Check for unique identiﬁers DescriptionQuick

2016-09-20 · \tag{6} \end{align} along with the requirement that $$\bfB$$ be lower triangular. There is a unique lower-triangular matrix $$\bfB$$ that satisfies \eqref{chol}; hence, we can uniquely recover the structure from the reduced form.

codebook is a great command in Stata. It describes data contents but also simply identifies unique values sysuse auto, clear codebook mpg, compact Number of unique values of mpg is 21. dups id, unique key(id) group by: id groups formed: 1 groups of duplicate observations: _group _count id 1 3 18 unique observations: _group _count id 1 1 191 2 1 171 3 1 147 4 1 26 5 1 22 An option called terse can be added to get summary information on duplicates. Dear Stata community, I am using Stata 13.1 to analyze survey data. I have discovered that some individuals have taken my survey twice or three times. I am able to identify these with the duplicates command and tag them having identified a group of variables which in combination should be unique for each unique respondent.

Best, Ben Ben Hoen LBNL Office: 845-758-1896 Cell: 718-812-7589 -----Original Message----- From: owner-statalist@hsphsun2.harvard.edu [ mailto:owner-statalist@hsphsun2.harvard.edu] On 2019-02-11 · Detect duplicate observations in a data set in Stata. You can check for duplicate observations in Stata in the following ways: The isid command can detect duplicate observations: . isid x1 x2 x3; The duplicates command can list and flag duplicate observations. The list subcommand lists the duplicate observations: . duplicates list x1 x2 x3 By adding an option unique, we also request information on groups that have a unique observation. For example, dups id, unique group by: id groups formed: 1 groups of duplicate observations: _group _count 1 3 unique observations: _group _count 1 1 2 1 3 1 4 1 5 1 unique in this way. Indeed, as we shall see, such usage is also to be found in oﬃcial Stata.

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## 2016-09-20 · \tag{6} \end{align} along with the requirement that $$\bfB$$ be lower triangular. There is a unique lower-triangular matrix $$\bfB$$ that satisfies \eqref{chol}; hence, we can uniquely recover the structure from the reduced form.

dups id, unique key(id) group by: id groups formed: 1 groups of duplicate observations: _group _count id 1 3 18 unique observations: _group _count id 1 1 191 2 1 171 3 1 147 4 1 26 5 1 22 An option called terse can be added to get summary information on duplicates. Dear Stata community, I am using Stata 13.1 to analyze survey data. I have discovered that some individuals have taken my survey twice or three times. I am able to identify these with the duplicates command and tag them having identified a group of variables which in combination should be unique for each unique respondent.

### distinct is a user-written program from the Stata Journal, as you are asked to explain (FAQ Advice #12). search distinct in Stata brings up clickable links. I've edited the output below, but anyone interested should

Let’s see how _n and _N work.

duplicates tag, generate(var) creates a new va countmatch counts observations for which each distinct value of var1 is Downstream of this you may wish to list each person and the corresponding count just once, and egen's tag() function offers (In an updated Stata 8, use l STATA added a variable _merge which equals 3 for all observations. This indicates that all observations are part of both files. If there were observations. Be able to perform a variety of data manipulations using Stata functions Therefore, in a dataset each observation has a unique value for _n (its row) but all one for the resulting 'tag' variable is not identical to running I want to add up the unique values in Stata. I applied the following command in egen unique=tag(sicff49 month) by sicff49 (month), sort: gen  Faster Stata for Big Data. including: collapse, reshape, xtile, tabstat, isid, egen, pctile, winsor, contract, levelsof, duplicates, unique/distinct, and more. This document briefly summarizes Stata commands useful in ECON-4570 varlist See summary information separately for each group of unique egen useIt = tag(state year) A variable equal to 1 in a single observation for each state- yea 4 Jan 2016 before a command, Stata will first break up the data set up into one group for each value of the by variable (or each unique combination of the  First, we read in that dataset, sort by that variable, and then we tag the first observation within each distinct group.
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One clue to by: being useful here is the structure of a grouping of the variable x into several distinct values. All we need to do is tag the first occurrence of each distinct value, and then count those first occurrences in sequence. codebook is a great command in Stata. It describes data contents but also simply identifies unique values sysuse auto, clear codebook mpg, compact Number of unique values of mpg is 21.

Thanks Nick! Your code has a number of additional insights (for me) in it over and above answering the questions. Best, Ben Ben Hoen LBNL Office: 845-758-1896 Cell: 718-812-7589 -----Original Message----- From: owner-statalist@hsphsun2.harvard.edu [ mailto:owner-statalist@hsphsun2.harvard.edu] On 2019-02-11 · Detect duplicate observations in a data set in Stata.
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### Thus unique observations are tagged with value 0, and all duplicate observations are tagged with values greater than 0. For checking double data entry, in which you expect just one surplus copy for each individual record, you can generate a tag variable and then look at observations with tag not equal to 1 because both unique observations

Thus, in the example just given, 1, 2, 3, and 4 would be reported by many as the unique values of the variable in question, even though such distinct values could all be repeated in the data—and, in particular, 2, 3, and 4 are indeed repeated. I want to add up the unique values in Stata. I applied the following command in Stata and realized afterwards that I am actually adding up duplicates as well, which is not what I intended to do. In conclusion, I want to calculate the industry market capitalization based on individual firms' unique observations in a given month that belong to this particular industry.

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### Thus, if values of a variable are 1, 2, 2, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, and 5, then in one sense of “unique”, there are five distinct or unique values—namely, 1, 2, 3, 4, and 5—whereas in another sense there is just one unique value—namely, 1, the only value that occurs precisely once.

The the unique values of the variable in question, even though such distinct values could all be repeated in the data—and, in particular, 2, 3, and 4 are indeed repeated.