I never used "by". Is "B" a list? If not, I am not sure if lapply can take it. Try aggregate().
On Fri, Aug 28, 2009 at 10:53 AM, 1Rnwb <sbpuro...@gmail.com> wrote: > > Hello list, > > I have a similar issue as this post > http://tolstoy.newcastle.edu.au/R/e6/help/09/04/11438.html#options2 and I > used the suggestion provided by Jorge with modifications to my data > do.call(c,lapply(your_list_with_the_t_tests,function(x) x$p.value)) > > but I am getting the following error after excuting the code > > B<-by(eo,eo$PlateID, function(.sub) t.test(mcp1~Self_T1D,data=.sub, > na.rm=T)) #ttest platewise > do.call(c,lapply(B, function(x) x$p.value)) > Error in do.call(c, lapply(B, function(x) x$p.value)) : > 'what' must be a character string or a function > > here "B" is equal to "your_list_with_the_t_tests. is something i am doing > wrong > > > -- > View this message in context: > http://www.nabble.com/extracting-pvalues-from-ttest-tp25192381p25192381.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > 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. > [[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.
