Hello, I am using "B" as a vector to store all the t.tests. since i am a newbie to both R and statistics I am not sure if "B" is the list. Also I see "c" used in the do.call formula and do not know what it is being used for. I used aggregate but getting this error" Error in aggregate.data.frame(eo, eo$PlateID, function(.sub) t.test(ENA78 ~ : 'by' must be a list". As i mention in my OP that I am using is function from an earlier post. any help is appreciated. Thanks Sharad
Jun Shen-3 wrote: > > I never used "by". Is "B" a list? If not, I am not sure if lapply can take > it. Try aggregate(). > > On Fri, Aug 28, 2009 at 10:53 AM, 1Rnwb <sbpuro...@gmail.com> wrote: > >> >> Hello list, >> >> I have a similar issue as this post >> http://tolstoy.newcastle.edu.au/R/e6/help/09/04/11438.html#options2 and I >> used the suggestion provided by Jorge with modifications to my data >> do.call(c,lapply(your_list_with_the_t_tests,function(x) x$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. > > -- View this message in context: http://www.nabble.com/extracting-pvalues-from-ttest-tp25192381p25348965.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.
