Re: st: RE: prtest and fweights

[Ron�n Conroy <rconroy@rcsi.ie>]

Nick Cox wrote:

> I can't comment on why not. I guess no 
> one asked, or no one thought of doing it. 
> For the moment, 
> preserve 
> expand  
> prtest 
> restore 
>  
But beware  of -expand-. If an observation represents a zero frequency, 
it will be retained. You will see a warning but it's a behaviour that 
you might not have anticipated.

I transcribe tables from papers that I am reviewing into Stata 
frequently, to cross-check stats, and it's easy to transcribe a zero 
without remembering that this will create a single observation in the 
expanded dataset.

--

Ronan M Conroy (rconroy@rcsi.ie) 
Senior Lecturer in Biostatistics 
Royal College of Surgeons 
Dublin 2, Ireland 
+353 1 402 2431 (fax 2764) 
-------------------- 
Just say no to drug reps 
http://www.nofreelunch.org/

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