Hi Cas,
something has gone wrong with attaching the data, or calculating new variables from old ones. The error message you get means that different variables in your model have different lenghts (so there's a mismatch).
for example, for a model of the form
glm(y~x+z)
you can check the lengths of x,z and y by
length(y)
length(x)
length(z)
The numbers returned should all be the same for a correct model specification. That makes it easy to spot where things went wrong.
good luck, Tom
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