topic Re: help with sample size calculation in SAS Procedures https://communities.sas.com/t5/SAS-Procedures/help-with-sample-size-calculation/m-p/98953#M27834 <HTML><HEAD></HEAD><BODY><P>Apparently you could do it as they did it here:</P><P><A href="http://www2.sas.com/proceedings/forum2008/368-2008.pdf" title="http://www2.sas.com/proceedings/forum2008/368-2008.pdf">http://www2.sas.com/proceedings/forum2008/368-2008.pdf</A></P><P></P><P>see bottom of page 1.</P></BODY></HTML> Tue, 05 Feb 2013 19:14:38 GMT AncaTilea 2013-02-05T19:14:38Z help with sample size calculation https://communities.sas.com/t5/SAS-Procedures/help-with-sample-size-calculation/m-p/98952#M27833 <HTML><HEAD></HEAD><BODY><P style="background: white;"><SPAN lang="EN" style="font-family: 'Helvetica','sans-serif'; color: #575757; font-size: 10pt;">I have group proportions of three groups, and I want to calcualte the sample size of each group (assuming equal sample size in each group, power is 0.8, alpha is 0.05).</SPAN></P><P style="background: white;"><SPAN lang="EN" style="font-family: 'Helvetica','sans-serif'; color: #575757; font-size: 10pt;">This type of calculation is easy to do when there are only two groups. I can use proc power; twosamplefreq. Does anyone know how to do it with three groups? Thanks</SPAN></P></BODY></HTML> Tue, 05 Feb 2013 18:52:57 GMT https://communities.sas.com/t5/SAS-Procedures/help-with-sample-size-calculation/m-p/98952#M27833 sky1 2013-02-05T18:52:57Z Re: help with sample size calculation https://communities.sas.com/t5/SAS-Procedures/help-with-sample-size-calculation/m-p/98953#M27834 <HTML><HEAD></HEAD><BODY><P>Apparently you could do it as they did it here:</P><P><A href="http://www2.sas.com/proceedings/forum2008/368-2008.pdf" title="http://www2.sas.com/proceedings/forum2008/368-2008.pdf">http://www2.sas.com/proceedings/forum2008/368-2008.pdf</A></P><P></P><P>see bottom of page 1.</P></BODY></HTML> Tue, 05 Feb 2013 19:14:38 GMT https://communities.sas.com/t5/SAS-Procedures/help-with-sample-size-calculation/m-p/98953#M27834 AncaTilea 2013-02-05T19:14:38Z