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← Revision 16 as of 2025-10-24 15:58:53 ⇥
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| = Metadata = | = Stata Metadata = |
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| Data about data. | Stata exposes a rich API for querying internal '''metadata'''. <<TableOfContents>> |
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| == Labeling == | |
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| === Variable Labels === | == Labels == Variable and value labels are primarily manipulated by the [[Stata/Label|`-label-`]] command. |
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| label variable VAR "var" | . label variable foo "yes or no?" . label define yesno 1 "Yes" 0 "No" . label values foo yesno . label list yesno yesno: 0 No 1 Yes |
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=== Value Labels === Value labels are defined separately from the actual dataset. |
Numeric values can be quickly prepended to value labels using the '''`-numlabel-`''' command. |
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| label define LABEL 0 "No" 1 "Yes" label define LABEL 99 "Missing", modify label values VAR LABEL |
numlabel foo, add mask("#. ") |
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| 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. |
To access or store the text of a variable label, try: |
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| numlabel LABEL, add mask("#. ") | local varlab_foo: variable label foo }}} To manipulate value labels, try: {{{ local vallab_foo: value label foo local vallab_foo_1: label `vallab_foo' 1, strict |
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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 |
Stata Metadata
Stata exposes a rich API for querying internal metadata.
Contents
Labels
Variable and value labels are primarily manipulated by the `-label-` command.
. label variable foo "yes or no?"
. label define yesno 1 "Yes" 0 "No"
. label values foo yesno
. label list yesno
yesno:
0 No
1 YesNumeric values can be quickly prepended to value labels using the -numlabel- command.
numlabel foo, add mask("#. ")To access or store the text of a variable label, try:
local varlab_foo: variable label foo
To manipulate value labels, try:
local vallab_foo: value label foo local vallab_foo_1: label `vallab_foo' 1, strict
Descriptives
display _N // number of cases display c(k) // number of variables