[R] ANOVA error
Peter Alspach
PAlspach at hortresearch.co.nz
Thu Jun 19 22:28:51 CEST 2008
Dani
> I have a dataframe named myMatrix with the structure
If it really is a dataframe, why is it called myMatrix :-) I guess you actually have a factor matrix. From the message below, Cr would appear to be a factor.
There are some fundamental distinctions in R (such as between a matrix and a dataframe, or between factor and numeric) which can seem 'subtle' as first. It is worth investing a bit of effort into understanding these. [My apologies if this is stating something which is obvious to you.]
HTH ....
Peter Alspach
> Treatment Time Cr mIb ...
>
> Being the treatment and time the predictors and Cr, mIb and
> so on the response variables. When I call
>
> Cr.aov <- aov(Cr~Treatment, data=myMatrix)
>
> I got this error:
>
> Error in storage.mode(y) <- "double" :
> invalid to change the storage mode of a factor In addition:
> Warning message:
> In model.response(mf, "numeric") :
> using type="numeric" with a factor response will be ignored
>
> Can anyone help me? I take the chance to ask another
> question. I would like to perform an ANOVA on different
> variables. Is the call aov(Cr+mIb+...~Treatment,
> data=myMatrix) o correct way of doing it? What I would like
> to have is a p value for the variance for each response variable.
> Best,
>
> Dani
>
> --
> Daniel Valverde Saubí
>
> Grup de Biologia Molecular de Llevats
> Facultat de Veterinària de la Universitat Autònoma de
> Barcelona Edifici V, Campus UAB
> 08193 Cerdanyola del Vallès- SPAIN
>
> Centro de Investigación Biomédica en Red en Bioingeniería,
> Biomateriales y Nanomedicina (CIBER-BBN)
>
> Grup d'Aplicacions Biomèdiques de la RMN Facultat de
> Biociències Universitat Autònoma de Barcelona Edifici Cs, Campus UAB
> 08193 Cerdanyola del Vallès- SPAIN
> +34 93 5814126
>
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