Displaying 2 results from an estimated 2 matches for "vanfem".
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vaneet
2008 Mar 24
0
Error using augPred with nlme grouped data
Hello all,
I am having a problem using augPred after I have created an nlme object. My
data is 3933 rows long with no NA's, and is grouped with this function:
vanfem<-groupedData(mass~age.years|name, data=av.mex, labels=list(x="Age",
y="Mass"), units=list(x="(years)", y="(kg)"))
Under the grouping factor "name", this is a character column with 12 levels
(i.e. 12 animals that I have collected "mass"...
2008 Feb 11
0
Memory allocation problem with large dataset
...problem. I am using R 2.6.1, and I have had similar problems in
S-plus.
My 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...