As Prof. Ripley said, the test on contrast is valid only if you selected the contrast before seeing the data. Using the same data for both hypothesis generation and hypothesis confirmation is extremely hazardous!
Andy > From: Igor Roytberg [mailto:[EMAIL PROTECTED] > > Hello, > > If you determine the means of x treatments and see that one > is larger than the others, can you use a sample normal to > determine how statistically significant the difference is? or > would contrasts by a better tool? How would one go about to > do this in R? > > Thanks for any help (since R is new to me), > > Igor ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help
