Date:         Tue, 7 May 2002 14:16:24 -0700
Reply-To:     prasad.s.ravi@HOUSEHOLD.COM
Sender:       "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:         Prasad Ravi <prasad.s.ravi@HOUSEHOLD.COM>
Subject:      Re: PROC GAM
Comments: To: Sean Kuo <kuo@STAT.UIOWA.EDU>
Content-type: text/plain; charset=us-ascii

Have you tried using GCV (Generalized Cross Validation) option for more
objective DF as


PROC GAM DATA=test;
   MODEL Y = SPLINE(X) /method=GCV;
RUN;


Prasad Ravi







                        Sean Kuo               To:    SAS-L@LISTSERV.UGA.EDU
                        <kuo@STAT.UIOWA.E      cc:
                        DU>                    Subject:    PROC GAM
                        Sent by: "SAS(r)
                        Discussion"
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                        05/07/2002 12:07
                        PM
                        Please respond to
                        Sean Kuo





Hi,

        I have question about setting the df in PROC GAM.  The data set
has 8425 obs with only x and y variables.  The code is

        PROC GAM DATA=test;
          MODEL Y = SPLINE(X, DF=12) ;
        RUN;

However, the output returned a df=20.368164 instead of 12 as I've seen in
some other examples.  The other question is what is the common setting for
df.  Any suggestion will be appreciated.  Thanks!

--Sean