Example3

Example 3:

There is no previous study available. In the new study, there are 100 subjects in control and active groups; the effect size is 0.1 and correlation (ρ) is 0.5. Also, we assume that the cluster size is 2. We want to estimate power of the proposed new study.

Here is the syntax:

%include "CluswilcoxPower.sas";

%CluswilcoxPower(ipnlst=100, ipmlst=100, est_mu=N, est_rho=N,dsn=, varn=, grp=,

mu=0.1,rho=0.5,igmin=2, igmax=2);

The output:

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New study 11:03 Monday, July 26, 2010 13

Number of clusters of size 1,2,3...

ipm1=clusters of size 1 (control group), ipm2=clusters of size 2 (control group)...

ipn1=clusters of size 1 (active treatment group)...

ipm2 ipn2

100 100

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New study 11:03 Monday, July 26, 2010 14

Obs w0g2 var0theta w1g2 var1theta power

1 807.615 .001238214 810.987 .001233066 0.12558