topic Re: PROC POWER sample size for lower bound of confidence interval in Statistical Procedures https://communities.sas.com/t5/Statistical-Procedures/PROC-POWER-sample-size-for-lower-bound-of-confidence-interval/m-p/156596#M8176 <HTML><HEAD></HEAD><BODY><P>I think you can refer the documentation about this procedure, there is an option to define the ratio.</P></BODY></HTML> Wed, 27 Nov 2013 05:56:33 GMT Jack2012 2013-11-27T05:56:33Z PROC POWER sample size for lower bound of confidence interval https://communities.sas.com/t5/Statistical-Procedures/PROC-POWER-sample-size-for-lower-bound-of-confidence-interval/m-p/156595#M8175 <HTML><HEAD></HEAD><BODY><P>How can I use proc power to calculate the sample size needed for the following</P><P>scenario:</P><P>2 independent groups 1:2 randomization </P><P>2-sided 95% confidence interval lower bound of the mean difference must exceed +2,<SPAN style="font-size: 10pt; line-height: 1.5em;">SD=3.1</SPAN></P><P>&nbsp; hel</P><P>How can I specify the lower bound in the SAS code?</P><P></P><P>&nbsp; <SPAN style="font-size: 11.0pt; font-family: 'Calibri','sans-serif';">Thanks!</SPAN></P></BODY></HTML> Tue, 26 Nov 2013 20:27:46 GMT https://communities.sas.com/t5/Statistical-Procedures/PROC-POWER-sample-size-for-lower-bound-of-confidence-interval/m-p/156595#M8175 msecic 2013-11-26T20:27:46Z Re: PROC POWER sample size for lower bound of confidence interval https://communities.sas.com/t5/Statistical-Procedures/PROC-POWER-sample-size-for-lower-bound-of-confidence-interval/m-p/156596#M8176 <HTML><HEAD></HEAD><BODY><P>I think you can refer the documentation about this procedure, there is an option to define the ratio.</P></BODY></HTML> Wed, 27 Nov 2013 05:56:33 GMT https://communities.sas.com/t5/Statistical-Procedures/PROC-POWER-sample-size-for-lower-bound-of-confidence-interval/m-p/156596#M8176 Jack2012 2013-11-27T05:56:33Z Re: PROC POWER sample size for lower bound of confidence interval https://communities.sas.com/t5/Statistical-Procedures/PROC-POWER-sample-size-for-lower-bound-of-confidence-interval/m-p/156597#M8177 <HTML><HEAD></HEAD><BODY><P>thank you, Jack2012, but there is no ratio in my example.&nbsp; I specifically need an example with a confidence interval around a mean difference.</P></BODY></HTML> Wed, 27 Nov 2013 13:34:05 GMT https://communities.sas.com/t5/Statistical-Procedures/PROC-POWER-sample-size-for-lower-bound-of-confidence-interval/m-p/156597#M8177 msecic 2013-11-27T13:34:05Z