Speaking Stata: Self and others
Nicholas J. Cox
Department of Geography
Durham University
Durham, UK
[email protected]
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Abstract. Data for people in a family, firms in a sector, or members of any
kind of group are often analyzed using data for the other members in each group.
Examples are the number of older children for each child in a family or the mean
investment of other firms in the same year. Many such problems yield to simple
logic, spelled out here in terms of useful Stata functions and commands. Operations
under by:, or an equivalent by() option, are frequently called for, while
the egen command offers a key tool for many calculations. Even when looping is
needed, some helpful tricks can be identified.
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Nicholas J. Cox
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groups, families, firms, counts, totals, means, by, egen
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