Statalist The Stata Listserver


[Date Prev][Date Next][Thread Prev][Thread Next][Date index][Thread index]

st: Re: permute


From   "Paul Fenner" <paulfenner@hotmail.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   st: Re: permute
Date   Sun, 09 Jul 2006 15:30:26 +0000

I often have to analyse small datasets and I normally use StatXact. I no longer have access to this program so I thought that I would use permute as an option. When I use the ranksum test I get reasonable agrrement between the probablities from StatXact and permute (e.g. asymptotic p=0.0749, permute p=0.0789 and StatXact p=0.0794). However when I use signrank I get no agreement at all e.g. asymptotic p 0.0431, permute p=1.00, StatXact p=0.0079). The code I am using is:
permute diff z=r(z), reps(10000) nowarn: signrank diff=0

Could somebody tell me if my code is in error, or am I entirley incorrect in using permute for exact calculations on small numbers.
Many thanks.
Paul

_________________________________________________________________
Windows Live™ Messenger has arrived. Click here to download it for free! http://imagine-msn.com/messenger/launch80/?locale=en-gb

*
* For searches and help try:
* http://www.stata.com/support/faqs/res/findit.html
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/




© Copyright 1996–2014 StataCorp LP   |   Terms of use   |   Privacy   |   Contact us   |   What's new   |   Site index