I met with a problem. The previous post dealt with loop, but mine is used in apply(). Please help.
On 2/12/08, Ng Stanley <[EMAIL PROTECTED]> wrote: > > Thanks, that problem looks very similar to mine. try is a nice hack. I was > thinking t.test would be intelligent enough to display NA if there are any > problems than to terminated. > > On 2/12/08, Richard Pearson <[EMAIL PROTECTED]> > wrote: > > > > Do you mean to deal with the situation where you're doing many t-tests > > in a loop? If so there was a post very recently on this list about this: > > > > https://stat.ethz.ch/pipermail/r-help/2008-February/153254.html > > > > Richard. > > > > > > Ng Stanley wrote: > > > Thanks. Someone please help to make t.test go through all the data and > > not > > > to be disrupted by the two problems. > > > > > > On 2/12/08, Petr PIKAL <[EMAIL PROTECTED]> wrote: > > > > > >> Hi > > >> > > >> [EMAIL PROTECTED] napsal dne 12.02.2008 09:09:23: > > >> > > >> > > >>> Hi, > > >>> > > >>> First problem: > > >>> > > >>>> test <- matrix(c(1,1,2,1), 2,2) > > >>>> apply(test, 1, function(x) { t.test(x) $p.value }) > > >>>> > > >>> Error in t.test.default(x) : data are essentially constant > > >>> > > >> make your data not constant > > >> > > >> > > >>> Second problem: > > >>> > > >>>> test <- matrix(c(1,0,NA,1), 2,2) > > >>>> apply(test, 1, function(x) { t.test(x) $p.value }) > > >>>> > > >>> Error in t.test.default(x) : not enough 'x' observations > > >>> > > >> increase number of observations > > >> > > >> > > >> > > >>> How to make t-test ignores this errors ? > > >>> > > >> Well, the procedure is complaining that you do not give it correct > > data. > > >> You shall be gratefull for a great software which prevent you from > > making > > >> silly things as try to compute t.test when data have zero variantion > > or > > >> number of observations is 1. > > >> > > >> Regards > > >> Petr > > >> > > >> > > >>> [[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<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<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.
