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Re: st: Why t- rather than z-statistics in svylogit?

From   Ronan Conroy <>
To   "statalist" <>
Subject   Re: st: Why t- rather than z-statistics in svylogit?
Date   Mon, 24 Nov 2003 15:03:04 -0000

on 24/11/2003 14:25, Richard Williams at wrote:

This is discussed on p. 357 of the Stata 8 Users guide (see point #2).  I 
can't say that I fully understand the explanation, but the key phrase seems 
to be "Using z rather than t statistics only yields a nontrivial difference 
when there is a small number of clusters (<50)." 

That strikes me as not an entirely unmeaningless statement. Does this mean
that the difference is important in any case when the number of clusters
goes above fifty? It could be clearer, so.

Incidentally, I live with someone who occasionally uses modified triple
negatives in conversation. Makes life colourful.

Ronan M Conroy (
Lecturer in Biostatistics
Royal College of Surgeons
Dublin 2, Ireland
+353 1 402 2431 (fax 2764) 

Ugh - what's that bitter taste in my coffee?

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