Date:         Fri, 3 Sep 2004 13:34:30 -0400
Reply-To:     bill_droogendyk@DOFASCO.CA
Sender:       "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:         Bill Droogendyk <bill_droogendyk@DOFASCO.CA>
Subject:      Re: Comparing multiple proportions: The Marascuillo procedure
Content-Type: text/plain; charset="iso-8859-1"

I'm displaying a lot of statistical naiveté here, but it seems to me that the Stephen's question touches on the concept of variation within and variation between.  If that's the case, would this not be a classic Quality Control situation where a Shewhart p chart is in order?  It's commonly used in manufacturing processes which are also not controlled studies.

wd
Today's gift is ... Today!

> Basically, I have an analysis situation where I want to test the
> significance of proportions within a week, and between weeks.  The
> data is very randomly collected (unbalance sample sizes and missing
> data), these
> are not controlled studies.