Just looking at it i would try renaming Task-Kind, Data-Kind an Time-Taken Those are ambiguous in the Formula.
"Task-Kind" vs "Task" - "Kind" Though that might not be the error at hand :) On 02.07.2012, at 14:15, zetwal wrote: > Hello > > I have some test data that looks like that from a within subject experiment. > Subject Task-Kind Data-Kind Time-Taken Correct > 1 A Data1 5 1 > 1 A Data1 3 0 > 1 A Data1 1 1 > 1 A Data2 8 1 > 1 A Data2 7 0 > 1 A Data2 5 0 > 1 A Data3 2 1 > 1 A Data3 7 0 > 1 A Data3 5 0 > 1 A Data3 6 0 > 1 B Data1 3 1 > 1 B Data1 1 1 > 1 B Data1 3 0 > 1 B Data2 9 0 > 1 B Data2 8 1 > 1 B Data2 5 0 > 1 B Data3 2 1 > 1 B Data3 7 2 > 1 B Data3 5 3 > 1 B Data3 6 0 > 1 C Data1 3 1 > 1 C Data1 1 1 > 1 C Data1 3 0 > 1 C Data2 9 0 > 1 C Data2 8 1 > 1 C Data2 5 0 > 1 C Data3 2 1 > 1 C Data3 7 2 > 1 C Data3 5 3 > 1 C Data3 6 0 > 2 A Data1 5 1 > 2 A Data1 3 0 > 2 A Data1 1 1 > 2 A Data2 8 1 > 2 A Data2 7 0 > 2 A Data2 5 0 > 2 A Data3 2 1 > 2 A Data3 7 0 > 2 A Data3 5 0 > 2 A Data3 6 0 > 2 B Data1 3 1 > 2 B Data1 1 1 > 2 B Data1 3 0 > 2 B Data2 9 0 > 2 B Data2 8 1 > 2 B Data2 5 0 > 2 B Data3 2 1 > 2 B Data3 7 2 > 2 B Data3 5 3 > 2 B Data3 6 0 > 2 C Data1 3 1 > 2 C Data1 1 1 > 2 C Data1 3 0 > 2 C Data2 9 0 > 2 C Data2 8 1 > 2 C Data2 5 0 > 2 C Data3 2 1 > 2 C Data3 7 2 > 2 C Data3 5 3 > 2 C Data3 6 0 > . > . > . > > some notes: > there are 20 subjects > there are 5 different kinds of tasks > There are 5 different kinds of data > and there are several different variations for a certain kind of task and > kind of data which is why for Subject = 1 Task-Kind=A and Data-Kind=Data1 > we have 3 different results. > > The measured parameters are time to complete the task and whether it was > correct or not (0 implies correct and 1 implies not correct) > > I am computing the anova as follows: > aov.ex = > aov(Correct~Task-Kind*Data-Kind+Error(Subject/(Task-Kind*Data-Kind)),data=allDataRaw.xp) > > since I want to see how the result is affected by the different kinds of > data as well as the the kind of task and I get a warning message saying: > Error() model is singular > > I would be very grateful if someone could please tell me what does this > mean. > Thanks > Pascal > > -- > View this message in context: > http://r.789695.n4.nabble.com/Error-model-is-singular-what-does-that-mean-tp4635103.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. ______________________________________________ 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.
