On Tue, 17 Jun 2014 10:30:17 AM suganthiny cumarasamy wrote: > Dear R mailing listers, > > I am try to find the different power calculation for > p1=0.2 and p2=0.4 , with significant level=0.05 (one sided test) > I would like to have a graph y -axis as a power and > x-axis as a sample size . > > I run this command for different value of power. and get the n and power > pwr.2p.test(h=ES.h(0.4,0.2), power = 0.87, > sig.level=0.05,alternative="greater") > > Is there is any easy way i can do power graph using the two proportion in > R. > Hi Suga, I'm not familiar with pwr.2p.test, but if it takes a vector of power values, you could do something like this:
# get a vector of sample sizes for different values of power # it probably won't be this straightforward powers<-seq(0.5,0.95,by=0.05) sample_sizes<-pwr.2p.test(h=ES.h(0.4,0.2),power=powers, sig.level=0.05,alternative="greater") plot(sample_sizes,powers) Jim ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.