Speaking Stata: MMXI and all that: Handling Roman numerals within Stata
Nicholas J. Cox
Department of Geography
Durham University
Durham, UK
[email protected]
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Abstract. The problem of handling Roman numerals in Stata is used to illustrate
issues arising in the handling of classification codes in character string form and
their numeric equivalents. The solutions include Stata programs and Mata functions
for conversion from numeric to string and from string to numeric. Defining
acceptable input and trapping and flagging incorrect or unmanageable inputs are
key concerns in good practice. Regular expressions are especially valuable for this
problem.
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Nicholas J. Cox
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fromroman, toroman, Roman numerals, strings, regular expressions, Mata, data management
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