[R] Meaningfulness of applying the delta method (sensu alr3)...

Dear All, I think this is a general stat plus R-related question. Firstly, the 'problem': I fitted non-linear (exponential-type) models to moisture ratio-time data using nls(); one of its parameters, k, is commonly designated as the constant of drying rate (the other are less important); in

[R] Help w/ density() usage

he midpoints of size-intervals (in this example each class is 0.4234 mm wide?!) Thanks in advance, Eduardo Esteves University of Algarve School of Technology (Portugal) ps-I'm trying implement the other steps of the procedure, so it's poss