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Re: st: strip factor variable operators?
From
[email protected] (Jeff Pitblado, StataCorp LP)
To
[email protected]
Subject
Re: st: strip factor variable operators?
Date
Tue, 13 Aug 2013 22:39:14 -0500
Stas Kolenikov <[email protected]> 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
[email protected]
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