j_brokelm

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Mixed ANOVA (lme) returns error for alphabetic variable

I have a large data set with persons who answered questionnaires at several measurement points. I want to run an ANOVA using the lme function with my 'SERIAL' variable as identifying the persons (which is the serial code of a person in letters and numbers, e.g. YVEDPEPGV9). So person YVEDPEPGV9 answ...
j_brokelm