Frequently Asked Questions
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data stat
91.
Using a plugin to connect to a database How do I connect to a database by using a Stata plugin?
92.
Multiple operations on data records How do I perform multiple operations on data records if a condition is met?
93.
Approximating the size of a dataset How big will my dataset be?
94.
First and last occurrences in panel data How can I identify first and last occurrences systematically in panel data?
95.
Column-mode selection in the Do-file Editor How can I use column-mode selection (select rectangles) and editing in the Do-file Editor?
96.
The relationship between the group variable and the treatment dummy variable in didregress and xtdidregress Why do I get an “invalid group specification r(198)” error when I fit a
difference-in-differences (DID) model by using didregress or xtdidregress?
97.
Relation between official mi and community-contributed ice and mim commands What is the relation between the official multiple-imputation command, mi, and the
community-contributed ice and mim commands?
98.
Random samples from an existing dataset How can I take random samples from an existing dataset?
99.
Identifying and dropping duplicate observations How do I identify duplicate observations in my data?
100.
Pooling data and performing Chow tests in linear regression How can I pool data (and perform Chow tests) in linear regression without constraining the residual
variances to be equal?
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