Hi all,

Apologies for the simplicity of my question..... I'm constructing a
multilevel model in R and I receive the following error.... if anyone can
indicate what the error means it would be greatly appreciated, thanks.

Model<- lmer(Res~Gender+(1|School)+(1|School:Student_ID), family=binomial,
data=Data)


Error: length(f1) == length(f2) is not TRUE
In addition: Warning messages:
1: In School:Student_ID :
  numerical expression has 41143 elements: only the first used
2: In School:Student_ID:
  numerical expression has 41143 elements: only the first used

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