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 > >> > >>> 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. > > > > > [[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.
