Re: st: strip factor variable operators?

[Stas Kolenikov <skolenik@gmail.com>]

Thanks, Nick and Jeff.

-- Stas Kolenikov, PhD, PStat (ASA, SSC)
-- Senior Survey Statistician, Abt SRBI
-- Opinions stated in this email are mine only, and do not reflect the
position of my employer
-- http://stas.kolenikov.name



On Tue, Aug 13, 2013 at 10:39 PM, Jeff Pitblado, StataCorp LP
<jpitblado@stata.com> wrote:
> Stas Kolenikov <skolenik@gmail.com> asks how to remove all time-series and
> factor variables opterators from a varlist specfication:
>
>> is there a simple way to strip out the time series and factor variable
>> operators? I have a list of regressors with all sorts of stuff like
>> -i.foreign ib3.rep78 c.price##c.price-, and I want to produce a list
>> that is cleaned off the prefixes, just -foreign rep78 price-. Is there
>> a standard parser, or an extended macro function, to do this? I can
>> take the whole list, -gettoken, parse(".")- each term and strip the
>> part before the dot, if there's any. But this seems like a relatively
>> mundane task that must be doable with some official Stata tools.
>
> Nick Cox pointed out that -tsrevar- was a start.
>
> Stas can use the -fvrevar- command to do this.  Here is an example:
>
> ***** BEGIN:
> . sysuse auto
> (1978 Automobile Data)
>
> . fvrevar i.foreign ib3.rep78 c.price##c.price, list
>
> . return list
>
> macros:
>             r(varlist) : "price foreign rep78"
> ***** END:
>
> --Jeff
> jpitblado@stata.com
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