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Date:   Thu, 19 Feb 2009 17:29:19 -0500
Reply-To:   Ligia Buia <ligia.buia@GMAIL.COM>
Sender:   "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:   Ligia Buia <ligia.buia@GMAIL.COM>
Subject:   sas/insight spline fit statistics
Content-Type:   text/plain; charset=ISO-8859-1


I am trying to understand how to interpret the statistics provided when I do a spline fit of my biological marker vs. time data. My specific questions are: Does my large MSE (GCV) tell me that there really is no trend? What constitutes an "acceptable" MSE? Should I be worried that my r-square value is so small? Here is part of my output:

c value: 0.3673 smoothing parameter: 0.1260 df: 8.3 r-square: 0.0456 mse: 69018 mse (gcv): 71724.288

Any help would be greatly appreciated!

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