Your data file has commas as the decimal point. Use read.csv2 for such files.
What happened was that PercentError was read as a factor, and you can't do ANOVA on factors. The warning > In addition: Warning message: > using type="numeric" with a factor response will be ignored in: > model.response(mf, "numeric") told you and us this quite explicitly. If you get an error, also look at the warnings which may well (as here) tell you what precipitated the error. On Thu, 6 Sep 2007, Emre Sevinc wrote: > I have exported a CSV file from my EXCEL worksheet and its last column > contained decimal values: > > Subject;Group;Side;Difference;PercentError > M3;1;1;; > M5;1;1;375;18,75 > M8;1;1;250;14,58 > M10;1;1;500;12,50 > M12;1;1;375;25,00 > . > . > . > > > When I tried to do ANOVA test on it, R complained by givin error: > >> Anova3LongAuditoryFemaleError.data <- read.csv("C:\\Documents\ and\ >> Settings\\Administrator\\My >> Documents\\CogSci\\tez\\Anova3LongAuditoryFemaleError.csv", header = TRUE, >> sep = ";") > >> Anova3LongAuditoryFemaleError.aov = aov(PercentError ~ (Group * Side), data >> = Anova3LongAuditoryFemaleError.data) > > Error in `storage.mode<-`(`*tmp*`, value = "double") : > invalid to change the storage mode of a factor > In addition: Warning message: > using type="numeric" with a factor response will be ignored in: > model.response(mf, "numeric") > > What must I do in order to make the ANOVA test on these fractional data? > > Regards. > > -- > Emre Sevinc > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@stat.math.ethz.ch 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. > -- Brian D. Ripley, [EMAIL PROTECTED] Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595 ______________________________________________ R-help@stat.math.ethz.ch 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.