Christoph Bier <[EMAIL PROTECTED]> writes:
> Hi,
>
> I use a little script� to make a chi-square-test on 162 factors (it
> makes no difference if I take the numeric variant of the factors). At
> factor nr. 4 is stops with an error:
>
> [1] "v1= V7.KARTM v11= V7.KAR1M"
> Error in chisq.test(d1, d2) : x and y must have at least 2 levels
>
> But x and y /have/ two levels ("nein", "ja"):
>
> > fbhint.spss1$V7.KARTM
> [1] nein nein nein nein nein nein nein nein nein nein nein nein nein
> nein nein
> [16] nein nein nein nein nein nein nein nein nein nein nein nein nein
> nein nein
> [31] nein nein nein nein nein nein nein nein nein nein nein nein nein
> nein nein
> [46] nein nein nein nein
> Levels: nein ja
>
> > fbhint.spss1$V7.KAR1M
> [1] nein nein nein nein nein nein nein nein nein nein nein nein nein
> nein nein
> [16] nein <NA> nein nein nein nein nein nein nein nein nein nein <NA>
> nein <NA>
> [31] nein nein nein nein nein nein nein nein nein nein nein nein <NA>
> <NA> nein
> [46] <NA> nein nein <NA>
> Levels: nein ja
>
> Or is there another meaning of 'levels' that doesn't correspond to the
> one returned above?
> Any hints what's going wrong/which mistake(s) I make?
Well, the error message might be slightly beside the point, but the
issue would seem to be that there are no "ja"'s inside either vector.
I.e. it first reduces each factor to those levels that are actually
present, then checks whether there are at least two levels.
You can't do a chisquare test on a table that looks like this
nein ja
nein 42 0
ja 0 0
--
O__ ---- Peter Dalgaard Blegdamsvej 3
c/ /'_ --- Dept. of Biostatistics 2200 Cph. N
(*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
~~~~~~~~~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907
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