Stata 15 help for decode

[D] encode -- Encode string into numeric and vice versa

Syntax

String variable to numeric variable

encode varname [if] [in] , generate(newvar) [label(name) noextend]

Numeric variable to string variable

decode varname [if] [in] , generate(newvar) [maxlength(#)]

Menu

encode

Data > Create or change data > Other variable-transformation commands > Encode value labels from string variable

decode

Data > Create or change data > Other variable-transformation commands > Decode strings from labeled numeric variable

Description

encode creates a new variable named newvar based on the string variable varname, creating, adding to, or just using (as necessary) the value label newvar or, if specified, name. Do not use encode if varname contains numbers that merely happen to be stored as strings; instead, use generate newvar = real(varname) or destring; see real() or [D] destring.

decode creates a new string variable named newvar based on the "encoded" numeric variable varname and its value label.

Options for encode

generate(newvar) is required and specifies the name of the variable to be created.

label(name) specifies the name of the value label to be created or used and added to if the named value label already exists. If label() is not specified, encode uses the same name for the label as it does for the new variable.

noextend specifies that varname not be encoded if there are values contained in varname that are not present in label(name). By default, any values not present in label(name) will be added to that label.

Options for decode

generate(newvar) is required and specifies the name of the variable to be created.

maxlength(#) specifies how many bytes of the value label to retain; # must be between 1 and 32,000. The default is maxlength(32000).

Examples

--------------------------------------------------------------------------- Setup . webuse hbp2 . describe sex

Create numeric variable gender based on the string variable sex and create value label gender . encode sex, generate(gender)

List values of sex and gender . list sex gender in 1/4

List values of sex and gender, but show numeric values of gender rather than the labels . list sex gender in 1/4, nolabel

List the names and contents of the gender value label . label list gender

--------------------------------------------------------------------------- Setup . webuse hbp2, clear . describe sex

Create numeric variable gender based on the string variable sex and create value label sexlbl . encode sex, generate(gender) label(sexlbl)

Describe the gender variable . describe gender

--------------------------------------------------------------------------- Setup . webuse hbp2, clear . describe sex

Create value label gender . label define gender 1 "female" 2 "male"

Change the value of sex in the second observation to other . replace sex = "other" in 2

Create numeric variable gender based on the string variable sex, adding to value label gender as necessary . encode sex, generate(gender)

List the names and contents of the gender value label . label list gender

--------------------------------------------------------------------------- Setup . webuse hbp3, clear . describe female . label list sexlbl

Create string variable sex based on the numeric variable female . decode female, generate(sex)

Describe variable sex . describe sex

List values of female and sex . list female sex in 1/4

List values of female and sex, but show numeric values of female rather than the labels . list female sex in 1/4, nolabel ---------------------------------------------------------------------------

Video example

How to convert categorical string variables to labeled numeric variables


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