[R] Error() model is singular - what does that mean

[Jessica Streicher]

Also, try googling for  - R model is singular - , there seem to have been a lot of people with that particular error.

On 02.07.2012, at 14:56, Jessica Streicher wrote:

> 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.
>> 
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> 
> ______________________________________________
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> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.