Re: st: use of if command after commands with options

[David Kantor <kantor.d@att.net>]

You need to either put the -if- qualifier before the comma:
  pca... if x==1, comp(6)
 or put it at the end, after a second comma:
  pca... , comp(6), if x==1

Commands have a "main" part and an "option" part. The comma switches 
back and forth between these two parts.

HTH
--David

At 01:03 PM 7/31/2008, Stephan Rudolfer wrote:

> I wish to use the if command to select a subset for estimation 
> purposes, but also use options for the main command.  This doesn't 
> seem to work, since stata thinks that "if" is a further option.  For 
> example, pca..., comp(6). If I follow this with "if x==1", it won't 
> work because stata thinks that "x==1" is a further option for pca.
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