[R] R Error, very odd....

Dieter Menne dieter.menne at menne-biomed.de
Mon May 11 09:01:08 CEST 2009

Katie2009 wrote:
> I'm trying to analyse some excel data in R.  The problem is that when i
> input the data with the first column as absolute values, everything works
> fine, can analyse as normal.  When I leave the first column unchanged to
> import negative numbers as well I get:
> 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

You did not tell us anything how you got the data from Excel, so I have to
guess. Try to re-arrange your Excel row so that the first (3 ? check the
docs; which docs? your unknown function's) lines contain non-missing data.

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