```Date: Wed, 14 Dec 2005 10:17:56 -0600 Reply-To: "Swank, Paul R" Sender: "SAS(r) Discussion" From: "Swank, Paul R" Subject: Re: how to draw f test function using sas? Comments: To: lixiaoyao Content-Type: text/plain; charset="us-ascii" try this. You vary the df as needed. dfn = df for numerato, dfd = df for denominator. If you need to go out further, just increase the upper end of the loop. If you want cummulative probability, replace the p = by p = probf(F,dfn,dfd); This assumes a central F distribution. data step1; dfn = 1; dfd = 100; do F = .1 to 10 by .1; p = probf(F+.05,dfn,dfd)- probf(F-.05,dfn,dfd); output; end; symbol i=join r=120; proc gplot; plot p*f / nolegend vminor=1 hminor=0; by dfn dfd; run; Paul R. Swank, Ph.D. Professor, Developmental Pediatrics Director of Research, Center for Improving the Readiness of Children for Learning and Education (C.I.R.C.L.E.) Medical School UT Health Science Center at Houston -----Original Message----- From: SAS(r) Discussion [mailto:SAS-L@LISTSERV.UGA.EDU] On Behalf Of lixiaoyao Sent: Wednesday, December 14, 2005 1:25 AM To: SAS-L@LISTSERV.UGA.EDU Subject: how to draw f test function using sas? Hi all Is there anyone who can tell me how to draw a f-test curve using sas? Thanks ```

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