The last part of my message is what I thought might be the cause - maybe your median is not an integer, so what category should it be mapped to? What do you get if you slip in an `as.numeric` before calculating the median? [if still an error, then there is definitely something else going wrong to report]
Then everything is ok.
> as.numeric(fbhint.spss1$V15.SP1) -> tmp.data2 > median(tmp.data2, na.rm=T) [1] 2
Christoph -- Christoph Bier, Dipl.Oecotroph., Email: [EMAIL PROTECTED] Universitaet Kassel, FG Oekologische Lebensmittelqualitaet und Ernaehrungskultur \\ Postfach 12 52 \\ 37202 Witzenhausen Tel.: +49 (0) 55 42 / 98 -17 21, Fax: -17 13
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