ok,many thanks.
发自 网易邮箱大师 On 2016-05-20 08:19 , Jim Lemon Wrote: Hi laomeng_3, Have a look at the padjust function (stats). Jim On Fri, May 20, 2016 at 1:56 AM, laomeng_3 <laomen...@163.com> wrote: > Hi all: > As to the anova, we can perform multiple comparison via TukeyHSD. > But as to chi-square test for frequency table,how to perform multiple > comparison? > > For example, if I want to compare 3 samples' ratio(the data has 3 rows,each > row corresponds to 1 sample,and has 2 columns,each column corresponds to > positive and negative respectively). > > > dat<-matrix(c(6,30,8,23,14,3),nrow=3) > dat > [,1] [,2] > [1,] 6 23 > [2,] 30 14 > [3,] 8 3 > > > > chisq.test(dat) > > Pearson's Chi-squared test > > data: dat > X-squared = 17.9066, df = 2, p-value = 0.0001293 > > > The result shows that the difference between the 3 samples is significant.But > if I want to perform multiple comparison to find out which pair of samples is > significantly different,which function should be used? > > > Many thanks for your help. > > My best > > > > 发自 网易邮箱大师 > [[alternative HTML version deleted]] > > > ______________________________________________ > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > 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. [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.
