Have a look at ?try try(t.test(x))
HTH, Thierry ------------------------------------------------------------------------ ---- ir. Thierry Onkelinx Instituut voor natuur- en bosonderzoek / Research Institute for Nature and Forest Cel biometrie, methodologie en kwaliteitszorg / Section biometrics, methodology and quality assurance Gaverstraat 4 9500 Geraardsbergen Belgium tel. + 32 54/436 185 [EMAIL PROTECTED] www.inbo.be Do not put your faith in what statistics say until you have carefully considered what they do not say. ~William W. Watt A statistical analysis, properly conducted, is a delicate dissection of uncertainties, a surgery of suppositions. ~M.J.Moroney -----Oorspronkelijk bericht----- Van: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Namens Ng Stanley Verzonden: dinsdag 12 februari 2008 11:56 Aan: r-help Onderwerp: Re: [R] How to make t.test handle "NA" and "essentially constantvalues" ? 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. ______________________________________________ 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.
