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When using nlmer:

nlmer(velocity~musclemass+musclewidth+(1|muscletype)+(1|observer))

the error:

Error in nlformula(mc <- match.call()) : is.numeric(nlpars <- start$nlpars) is not TRUE

arises. What could be wrong with my model?

I did not include a Nonlin(...) part. I tried including this by pasting ~ SSlogis(musclemass, 1, 2, 2) directly after velocity, but still the error arises.

Dave2e
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Veer
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1 Answers1

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You are fitting a linear model in a function that expects a nonlinear model and you are missing the mixed part. From the man page: a formula of the form ‘resp ~ nlmod ~ meform’ where ‘resp’ is an expression for the response, ‘nlmod’ is the nonlinear model expression and ‘meform’ is the mixed-effects model formula.

Philippe
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