```Date: Wed, 23 Dec 2009 10:03:56 -0800 Reply-To: Ted Clay Sender: "SAS(r) Discussion" From: Ted Clay Subject: Re: how to test the signicanace Comments: To: Jeff In-Reply-To: <6716d5d0912230654m6c946d93k6beb9aa877c98040@mail.gmail.com> Content-Type: text/plain; charset="us-ascii" * I think this might help. One way to do this is to create a data set with the 4 cells of a 2-by-2 table, and let PROC FREQ do the test of significance. The key is the "WEIGHT" statement in PROC FREQ. ; Data ready; Group=1; admitted='Yes'; Num=Y1; output; Group=1; admitted='No '; Num=X1-Y1; output; Group=2; admitted='Yes'; Num=Y2; output; Group=2; admitted='No '; Num=X2-Y2; output; Run; Proc freq data=ready; Table group*admitted; Weight Num; Run; You will get a Chi-square test by default. A 2-tailed Fisher's exact test would be my choice of test, which requires adding "/exact". You might also be interested in relative risk statistics and confidence intervals, which requires you to pay close attention to which is "row 1" and "column 1". TC -----Original Message----- From: SAS(r) Discussion [mailto:SAS-L@LISTSERV.UGA.EDU] On Behalf Of Jeff Sent: Wednesday, December 23, 2009 6:55 AM To: SAS-L@LISTSERV.UGA.EDU Subject: how to test the signicanace Two group of people. all people in G1 is in a health plan, and these in G2 is not G1 have x1 member, and y1 hospital admits. hospital admit rate is hr1=y1/x1 G2 has x2 member and y1 hospital admits. hospital admit rate is h21=y2/x2 I want to test if there is significant difference between G1 and G2. What kind test should I use? Thanks. JP ```

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