[R] Problem with a non-factor, non-numeric variable in a data.frame
John Kane
jrkrideau at yahoo.ca
Tue Nov 6 21:09:16 CET 2007
Have a look at the R-FAQ issue 7.10. It's a standard
problem
For more information about your variable try
str(variable).
--- Alexandre Santos <alexandre.santos at ochipepe.org>
wrote:
> Dear R list,
>
> I would like to perform an ANOVA in a set of
> measurements, but I have
> problems formatting the data.
>
> The data is a two dimensional array containing two
> columns:
> - "Stim" : the type of stimulation (string)
> - "Ratio" : a ratio of two numeric values
>
> Now, because some values are missing in the data
> (defaulting to zero),
> part of this array will be populated with NA ratios.
> Maybe this is
> important later.
>
> In order to make the ANOVA analysis, I need to turn
> my vector into a data.frame.
>
> I tried vector.table=as.data.frame(vector)
>
> But I realized that
> is.numeric(Ratio) gives FALSE
> is.factor(Ratio) gives TRUE
>
> After reading the documentation, I tried
>
> vector.table=as.data.frame(vector, stringsAsFactors
> = FALSE)
>
> This time
>
> is.numeric(Ratio) gives FALSE
> is.factor(Ratio) gives FALSE
>
> So I don't even know what is Ratio, but it's not yet
> numeric (is this
> due to the NA values?).
>
> How can I get R to understand that Ratio is numeric?
> Checking the
> documentation it seems you can do it with I(x), but
> the details are
> not explained. I also tried as.numeric(Ratio), and
> everything was
> turned into zeros.
>
> Any suggestions?
>
> Cheers,
>
> Alexandre Santos
>
> Neuro-MPI, Martinsread, Germany
>
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