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2011 Feb 23
0
Over-constrained? gamma mixtures using R: mix{mixdist}
....77), c(9.174,29.54), c(9.983,12.369)); names(PP2Pars)<-c("pi", "mu", "sigma") mixk2<-mix(NotLinkedPP3, PP2Pars, dist="gamma",constr=list(conpi="NONE",conmu = "MFX", consigma = "SFX", fixpi = NULL, fixmu = c(TRUE,TRUE), fixsigma = c(TRUE,TRUE), cov = NULL, size = NULL)) If I allow any one of the 4 constrained parameters to become unconstrained then the model runs and gives sensible results but if I constrain all four parameters then I get the following error. "Error in nlm(multineg2llg, mulpseudomixdat = mspseudo...