Date:         Wed, 23 Dec 2009 14:53:53 -0500
Reply-To:     Jeff <zhujp98@GMAIL.COM>
Sender:       "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:         Jeff <zhujp98@GMAIL.COM>
Subject:      Re: how to test the signicanace
Comments: To: Ted Clay <tclay@ashlandhome.net>
In-Reply-To:  <004601ca83fa$4bf328d0$e3d97a70$@net>
Content-Type: text/plain; charset=ISO-8859-1

Thanks.
Is it possible to do a binomial proposion test to G1 and G2 and how?
Thanks,
Jeff

On Wed, Dec 23, 2009 at 1:03 PM, Ted Clay <tclay@ashlandhome.net> wrote:

> * 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
>
>
>