Richard Williams <[email protected]> asks how to check the dataset
in memory for the survey settings from -svyset-:
> What is the best way for a program to check if a file is svyset?
In your estimation command, when the specified options require the data to be
-svyset-, use the -_svy_newrule- command. Just make sure you call it under
the correct version control:
program mycmd, eclass ...
version 8.2
local caller : di "version " string(_caller()) ":"
...
if "`svy'" != "" {
`caller' _svy_newrule // check for settings
}
...
end
-_svy_newrule- is a (perhaps misnamed) not-documented command that will report
an error message if the data is not -svyset-.
> Further, is it possible to check whether a file was svyset under version 9
> (when the format changed) as opposed to an earlier version?
Under version control less than 9, -svyset- returns "set" in r(_svy) when the
data is -svyset- under the old survey design characteristics.
In Stata 9 (under version 9.0 and up) -svyset- stores ", clear" in r(settings)
when the data is not -svyset-.
--Jeff
[email protected]
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