Hi Tammy, I'm afraid this is pretty obviously homework, so we can't really do much to help you. It's not a personal thing: just the considered opinion of this list to believe that giving you answers (or even hefty hints) may undermine whatever intent your teacher has in assigning the problem. There are a good number of us in education of one form or another who wouldn't appreciate having that done, so it's really just professional courtesy.
I can direct you to the help manuals that ship with R, however: simply type help.start() at the prompt and you will be given a good suite of options. Cheers, Michael On Mon, Oct 22, 2012 at 12:08 PM, Tammy Ma <metal_lical...@live.com> wrote: > > Dear R-User, > > I met the problem to test equality of variance. > > Two sample units: > conjps<-c(9.41,10.45,10.78,10.73,11.11,11.12,11.59,11.04,11.63) > > ms<-c(4.11,5.10,5.70,6.46,6.04,6.16, 6.24,6.32,7.33) > > Then I use the F test to test: > > > > 謬est Equality > of > Two Variances > > F > test to compare two variances > > > > data: > conjps and ms > > F = 0.5419, num df = 8, > denom df = 8, > p-value = 0.4045 > > alternative hypothesis: true ratio of > variances is not equal to 1 > > 95 percent confidence interval: > > 0.1222368 2.4024170 > > sample estimates: > > ratio of variances > > > 0.5419076 > > > but If conjps is replaced by conjps1: shifting the first value and the last > value position > conjps1<-c(11.36,10.45,10.78,10.73,11.11,11.12,11.59,11.04,9.41) > > I do believe we get the same result when testing the equity of variance. but > how do I distringuish this two cases by testing? > Kind regards,Tammy > > > > > [[alternative HTML version deleted]] > > > ______________________________________________ > 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. > ______________________________________________ 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.
