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Re: st: m stat for sign test


From   Chris Witte <eljefespeaks@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: m stat for sign test
Date   Thu, 9 Oct 2008 12:19:48 -0700 (PDT)

ok, and then I can get the M stat by:
 
display (r(N_pos)-r(N_neg))/2
 
correct?



----- Original Message ----
From: Richard Goldstein <richgold@ix.netcom.com>
To: statalist@hsphsun2.harvard.edu
Sent: Thursday, October 9, 2008 1:53:42 PM
Subject: Re: st: m stat for sign test

this information is saved by Stata as part of standard practice -- to 
see what is saved type -return li- after you run -signtest- or look at 
the help file or the manual

Rich

Chris Witte wrote:
> The excerpt below is taken from SAS's help.  This is what I would like in addition to the p-value:
> 
> Sign Test
> 
> PROC UNIVARIATE calculates the sign test statistic as 
> 
> M=(n+ -n- )/2 
> 
> where n+ is the number of values that are greater than mu_o and n- is the number of values that are less than mu_o. Values equal to mu_o are discarded. Under the null hypothesis that the population median is equal to mu_o
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