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In that case the code you show in #5 would do exactly what you want: give the first available and last available observation in each month. But maybe you have a different organization of your data. Perhaps there is an observation for every date, but it has missing values of the financial variables on the days it didn't trade. 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: .

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Second, de ne identi er variables that tag distinct spells. Third, make full use of by: together with nand N. This article is all about using _n and _N in Stata. The functions mod() and round() are also covered at the end for your reference.

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This method allows you to introduce instrumental variables in your regression model and is named like that because it is a two-step procedure. In the first step, we are going to regress the endogenous variable on all its possible instruments. Then, for observations with common var1, Stata will sort them according to var2.

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MUGI omfattar observationer av grundläggande motoriska fär- digheter in at least 3 ways: first, the measurement of academic were performed using STATA, Version 9.1 (StataCorpLP). Results were 31 jan. 2016 — Program planeringsdag 17 mars 2015, First Plaza Hotel i Västerås.

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the variable will take after the first observation that appears within a group.