Speaking Stata: Truth, falsity, indication, and negation
Nicholas J. Cox
Department of Geography
Durham University
Durham, UK
[email protected]
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Abstract. Many problems in Stata call for selection of observations according to
true or false conditions, indicator variables flagging the same,
groupwise calculations, or a prearranged sort order. The example of
finding the first (earliest) and last nonmissing value in panel or
longitudinal data is used to explain and explore these devices and how
they may be used together. Negating an indicator variable has the
special virtue that selected observations may be sorted easily to the
top of the dataset.
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Nicholas J. Cox
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true or false, logical, Boolean, indicator variable, dummy variable, sort, by, panel data, longitudinal data, programming, data management
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