Speaking Stata: Rowwise
Nicholas J. Cox
Department of Geography
Durham University
Durham City, UK
[email protected]
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Abstract. Stata’s main data model treats observations in rows and variables in
columns quite differently, but rowwise problems also arise that require
working against the grain. This column shows how to exploit existing
functions and egen functions when they exist and apply to such
problems. It offers advice on how to build your own loops, egen
functions, or programs when needed. Mata provides especially convenient
tools for constructing many such functions and programs, centered on putting
selected data into matrices and then processing each observation as a
separate vector. Two programs, rowsort and rowranks, are
formally published with this column.
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Nicholas J. Cox
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rowsort, rowranks, rows, functions, loops, egen, Mata, minimum, maximum, median, any, all, distinct values, sorting, ranking
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