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Hi all, I hope this isn't a naive newbie question again. Here you can see column 264 of a data frame containing data of the same interview in May and September. Column 264 contains the answers of 49 persons to a question in May. > fbhint.spss1[,264] [1] teils/teils sehr wichtig <NA> <NA> sehr wichtig [6] sehr wichtig sehr wichtig sehr wichtig <NA> <NA> [11] <NA> <NA> wichtig <NA> <NA> [16] sehr wichtig <NA> <NA...

...ors (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...