Date:         Tue, 26 Aug 2008 08:44:31 -0500
Reply-To:     Robin R High <rhigh@UNMC.EDU>
Sender:       "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:         Robin R High <rhigh@UNMC.EDU>
Subject:      Re: Proc Power
Comments: To: Bminer <b_miner@LIVE.COM>
In-Reply-To:  <d7fa8dd0-c2ef-4b76-9aaa-4e20960496e8@p25g2000hsf.googlegroups.com>
Content-Type: text/plain; charset="US-ASCII"

It appears to allow you to specify a difference in the two proportions
other than 0 for a null hypothesis

* e.g., Test H0: p1 - p2 = .01 ;

PROC POWER;
TWOSAMPLEFREQ
   TEST = pchi
   SIDES = 2
   ALPHA = .05
   GROUPPROPORTIONS = (.45 .25)
   NULLPROPORTIONDIFF=.01      /* need to enter TEST=pchi and either
GROUPPROPORTIONS or PROPORTIONDIFF options */
   NTOTAL = 100
   POWER = .
;
RUN;

Robin High
UNMC




Bminer <b_miner@LIVE.COM>
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08/25/2008 08:20 PM
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Bminer <b_miner@LIVE.COM>


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Subject
Proc Power






If anyone has experience with Proc power:

What does NULLPROPORTIONDIFF do exactly?

Thanks

brian