|
Size: 1760
Comment:
|
Size: 925
Comment:
|
| Deletions are marked like this. | Additions are marked like this. |
| Line 1: | Line 1: |
| = Metadata = | = Stata Metadata = |
| Line 13: | Line 13: |
| == Variable Names == | == Labels == |
| Line 15: | Line 15: |
| 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. |
| Line 18: | Line 18: |
| // 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 |
| Line 28: | Line 23: |
| 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. |
| Line 31: | Line 28: |
| renpfix v V renpfix new_ // TODO: how did older versions rename variable to lowercase? }}} ---- == Labels == === Variable Labels === {{{ 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("#. ") |
numlabel foo, add mask("#. ") |
Stata Metadata
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.
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("#. ")
Quick Tips
Stata has a number of interactive tools for examining metadata.
di _N // number of cases di c(k) // number of variables