Stata 15 help for if


[U] 11.1.3 if exp


command if exp

exp in the syntax diagram means an expression, such as age>21. See exp for an explanation of expressions.

There is another if used in Stata programming; see [P] if.


if at the end of a command means the command is to use only the data specified. if is allowed with most Stata commands.


. sysuse auto . list make mpg if mpg>25 . list make mpg if mpg>25 & mpg<30 . list make mpg if mpg>25 | mpg<10 . regress mpg weight displ if foreign==1

Equality tests are performed by two equal signs (==), not one =; see operators.

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