Date:         Wed, 23 Dec 2009 09:54:52 -0500
Reply-To:     Jeff <zhujp98@GMAIL.COM>
Sender:       "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:         Jeff <zhujp98@GMAIL.COM>
Subject:      how to test the signicanace
Content-Type: text/plain; charset=ISO-8859-1

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