Louisa Hay wrote: > > Hi, > I am trying to create a power curve to show how the power of a t-test varies > depending on the mean. Any ideas how I should go about this? > Louisa The pt() function supports a non-centrality parameter, so you can do this calculation directly.
For other situations where the non-null distribution isn't easy to work with, there's always simulation. Just simulate a large number of samples, and compute how many of them are rejected. Duncan Murdoch ______________________________________________ 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.
