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qvartemp
2004 Oct 18
3
manual recreation of varConstPower using new fixed effects variables in nlme
...in the
data frame, d1 and d2. I am using a self-made
function, fx, which contains a logistic equation. It
all works just fine in combination with the built-in
varConstPower variance structure.
I try to mimic the varConstPower structure by using
the varPower variance function:
varPower(form= ~vartemp, fixed= .5)
and then passing the variables d1 and d2 to fx and
adding a statement in fx like:
vartemp <- (d1+theta^d2)^2
where theta is my covariate.
However, even though the built-in varConstPower
function does work with my data set, the substitute
function discussed above does not work...