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vanfemfit2
2008 Feb 11
0
Memory allocation problem with large dataset
...is mass growth data from the same 8 animals over 10 years, and is
a data.frame with 23,598 rows and 5 columns, and using object.size(data)=
664448 bytes. My first model, using the VonBertalanffy growth function:
vanfemfunc<-function(age.years, A, lk, t0)
A*((1-exp(-exp(lk)*(age.years-t0)))^3)
vanfemfit1<-nlme(model=mass~vanfemfunc(age.years, A, lk, t0), data=vanfem,
fixed=A+lk+t0~1, start=c("A"=201.8, "lk"=-1.17, "t0"=-2.71))
This fits fine, and has an object size of 3605660 bytes. When I try this
second model that involves a correlation structure for the random...