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fipi
2011 Feb 23
0
Over-constrained? gamma mixtures using R: mix{mixdist}
...used:
PP2Pars<-data.frame(c(0.23,0.77), 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(...