## Stata 15 help for cond()

```
[FN] Programming functions

Function

cond(x,a,b[,c])
Description:  a if x is true and nonmissing, b if x is false, and c if
x is missing; a if c is not specified and x evaluates to
missing

Note that expressions such as x>2 will never evaluate to
missing.

cond(x>2,50,70) returns 50 if x > 2 (includes x > .)
cond(x>2,50,70) returns 70 if x < 2

If you need a case for missing values in the above
examples, try

cond(missing(x), ., cond(x>2,50,70)) returns . if x is
missing, returns 50 if x > 2, and returns 70 if x < 2

If the first argument is a scalar that may contain a
missing value or a variable containing missing values,
the fourth argument has an effect.

cond(wage,1,0,.) returns 1 if wage is not zero and not
missing
cond(wage,1,0,.) returns 0 if wage is zero
cond(wage,1,0,.) returns . if wage is missing

Caution: If the first argument to cond() is a logical
expression, that is, cond(x>2,50,70,.), the fourth
argument is never reached.
Domain x:     -8e+307 to 8e+307 or missing; 0 means false, otherwise
interpreted as true
Domain a:     numbers and strings
Domain b:     numbers if a is a number; strings if a is a string
Domain c:     numbers if a is a number; strings if a is a string
Range:        a, b, and c

```