Speaking Stata: From rounding to binning
Nicholas J. Cox
Department of Geography
Durham University
Durham, UK
[email protected]
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Abstract. This is a basic review of how to bin variables in Stata, meaning how to divide
their range or support into disjoint intervals. I survey rounding functions
with emphasis on floor and ceiling functions as tools to get clearly defined
intervals of equal width. Using a specific display format is usually a better
idea than rounding to multiples of a fraction. Quantile binning is popular in
several fields. I give tips and tricks on how to produce such bins and also on
how to show their limitations. Experimentation with the display command
or Mata is a good way to learn about functions and to test binning rules.
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Nicholas J. Cox
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binning, rounding, format, display, quantiles
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