How about this:
exp(coef(model3$modelStruct$varStruct)[const])
const
0.6551298
Does that answer the question about not understanding the connection
between summary(model3) and coef(model3$modelStruct$varStruct)[const]?
Regarding the question about R not
I have been using gnls with the weights argument (and varConstPower) to
specify a variance structure for curve fits. In attempting to extract the
parameters for the variance model I am seeing results I don't understand.
When I simply display the model (or use summary on the model), I get what
seem
