[R] Confidence intervals for predicted values in nls

Cristina Silva csilva at ipimar.pt
Thu Jun 3 17:53:57 CEST 2004

Dear all

I have tried to estimate the confidence intervals for predicted values of a
nonlinear model fitted with nls. The function predict gives the predicted
values and the lower and upper limits of the prediction, when the class of
the object is lm or glm. When the object is derived from nls, the function
predict (or predict.nls) gives only the predicted values. The se.fit and
interval aguments are just ignored.

Could anybody tell me how to estimate the confidence intervals for the
predicted values (not the model parameters), using an object of class nls?



Cristina Silva
IPIMAR - Departamento de Recursos Marinhos
Av. de Brasília, 1449-006 Lisboa
Tel.: 351 21 3027096
Fax: 351 21 3015948
csilva at ipimar.pt

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