Differences between revisions 14 and 15

Stata Metadata

Stata exposes a rich API for querying internal metadata.

Contents

Labels

Variable and value labels are defined using the label command.

label variable foo "yes or no?"
label define yesno 1 "Yes" 0 "No"
label values foo yesno

See here for more options.

Numeric values can be quickly prepended to value labels using the numlabel command.

numlabel foo, add mask("#. ")

display _N    // number of cases
display c(k)  // number of variables

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-Stata offers human-readable variable names, variable labels, variable printing formats, and value labels.

Stata stores variable labels and value labels in a separate database. Many built-in commands seamlessly pull in metadata from that database, but there are notable exceptions.
+Stata exposes a rich API for querying internal '''metadata'''.
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-== Quick Tips ==

Stata has a number of interactive tools for examining metadata.
+== Descriptives ==
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-di _N    // number of cases
di c(k)  // number of variables
+display _N    // number of cases
display c(k)  // number of variables