[R] error propagation

Manuel Gutierrez manuel_gutierrez_lopez at yahoo.es
Thu Dec 29 10:05:36 CET 2005

Are there any functions to do error propagation in R?
 I have done a search with little success. Any
pointers to read about this topic are greatly
My specific problem is: I use a linear model (lm) to
predict the biomass of an individual in a population,
then I add up the biomass of all individuals to
calculate the total mass of the population. I want to
calculate the error in the final estimate of the total
Also, I have another case where I use a nls model
instead of the lm, but in nls se.fit is currently
ignored as stated in the help page. Is there an
alternative way to calculate the errors in the
predictions from nls?

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