Stata 15 help for is_svy
Title
[SVY] is_svy  Determine if the last estimation command belongs to the
svy class
Syntax
is_svy [, regression]
Description
is_svy returns in r(is_svy) whether (1) or not (0) the last estimation
command belongs to the class of svy commands. Note that svy treats both
"summary commands" such as svymean and regression type commands such as
svyregress as estimation commands.
Option
regression specifies that r(is_svy) indicates whether or not the last
estimation command is a svy regression command.
