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| ## page was renamed from StataMetadata = Metadata = |
= Stata Metadata = |
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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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| == Variable Names == | == Labels == |
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| Variables are (re)named using the `rename` command. Since Stata 12, it offers some advanced features: | Variable and value labels are defined using the '''`label`''' command. |
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| // rename all variables with a leading 'v' such that the 'v' is replaced with a 'V' rename v* V* // rename all variables with a leading 'new_' such that the prefix is stripped rename new_* * // rename all variables to a lowercase name rename *, lower |
label variable foo "yes or no?" label define yesno 1 "Yes" 0 "No" label values foo yesno |
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| For older versions of Stata, try these: | See [[Stata/Label|here]] for more options. Numeric values can be quickly prepended to value labels using the '''`numlabel`''' command. |
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| renpfix v V renpfix new_ // TODO: how did older versions rename variable to lowercase? |
numlabel foo, add mask("#. ") |
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| == Labels == === Variable Labels === |
== Descriptives == |
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| label variable VAR "var" }}} === Value Labels === Value labels are defined separately from the actual dataset. {{{ label define LABEL 0 "No" 1 "Yes" label define LABEL 99 "Missing", modify label values VAR LABEL }}} By default, labels cannot be overwritten. The '''add''' option allows new values to be inserted into an existing label. The '''replace''' option allows existing values to be overwritten in an existing label. The '''modify''' option combines both. Numeric values can be added to value labels using the '''numlabel''' command. {{{ numlabel LABEL, add mask("#. ") }}} ---- == Quick Tips == Stata has a number of interactive tools for examining metadata. {{{ di _N // number of cases di c(k) // number of variables |
display _N // number of cases display c(k) // number of variables |
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("#. ")
Descriptives
display _N // number of cases display c(k) // number of variables