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Date:         Mon, 29 Oct 2001 16:26:45 -0600
Sender:       "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:         Warren Schlechte <wschlech@KTC.COM>
Subject:      dscale or pscale: Proc Genmod
Content-Type: text/plain; charset="iso-8859-1"

In Genmod, you can specify overdispersed model errors with the pscale and dscale options. How do you decide which one is the more proper for any situation? How does one report results if the results of the hypothesis tests change depending upon which scale term is used? For example, in one model that I examined, the follow were the results:

Contrast Estimate SE Alpha Confidence Limits Chi-Sq Prob>Chi-Sq NOSCALE 10K-Control -1.0151 0.4682 0.05 -1.9326 -0.0975 4.70 0.0301

DSCALE 10K-Control -1.0151 0.6818 0.05 -2.3514 0.3212 2.22 0.1365

PSCALE 10K-Control -1.0151 0.5654 0.05 -2.1233 0.0931 3.22 0.0726

Thanks for your comments.

Warren Schlechte Heart of the Hills Research Station HC7 Box 62 Ingram, Texas 78025 Phone: 830.866.3356 Fax: 830.866.3549

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