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2002 Oct 11
1
absurd computiation times of lme
...ss children doesn't change much, and
I can't use less knots.
Although I don't expect reasonable results from that, but even with
only three children (as below) the computation wouldn't stop soon.
Data looks like below, B1..B5 are the basis matrix for the
spline basis, and I use
kidGroup <- groupedData(height ~ B1+B2+B3+B4+B5 -1 | Id, data=kids)
fm <- lme(kidGroup)
Using a model like
kidGroup <- groupedData(height ~ sqrt(age) | Id, data=kids)
works very fast, but the model is not appropriate and the
fitting is bad.
What is the reason for this exponential-lookking incr...