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5 results for “from:Roger Humphry”

No data for 1 interaction combination: problem in R not Genstat
Roger Humphry · Apr 12, 2011 · r-sig-mixed-models

Thank you Ben and Douglas for your help. Roger

daisy function in cluster- coerced NAs
Roger Humphry · Feb 22, 2007 · r-help

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No data for 1 interaction combination: problem in R not in Genstat
Roger Humphry · Apr 11, 2011 · r-sig-mixed-models

I've found that when I do a linear mixed model either with lme or lmer with interactions amongst some fixed effects that if there are any interaction levels unoccupied with data that the model fails. "Error in MEEM(object...

Over-constrained? gamma mixtures using R: mix{mixdist}
Roger Humphry · Feb 23, 2011 · r-help

Dear R-help, my aim is to fit a constrained 2 component gamma mixture using mix within package mixdist. The constraints being fixing both of the means and both of the sigmas. Thus the only unconstrained parameter I wish to...

No data for 1 interaction combination: problem in R not in Genstat
Roger Humphry · Apr 18, 2011 · r-sig-mixed-models

Continuing an earlier thread in case this is of interest to anyone. I earlier proposed 2 solutions to the problem of including an interaction of fixed effects where there was one or more levels of the interaction lacking any data...

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