The classes and the names of some functions do not match!

[lijuanyan122]

For EXD.2(), EXD.3(), AR.2() and AR.3(), the class of the models specified is "Weibull" (as below)?

For example:
str(EXD.2())
$ fixed : num [1:4] 1 0 NA NA

• attr(*, "class")= chr "Weibull-1"

I know that Weibull and exponential models are similar. Is it on purpose?

[hreinwald]

Hi @lijuanyan122 👋

This is indeed intentional — EXD.2/EXD.3 are mathematically special cases of the Weibull type 1 model (with slope b fixed at 1), and AR.2/AR.3 are special cases of Weibull type 2, which is why they carry the "Weibull-1" / "Weibull-2" class.

The the latest refactored drc version now documents this relationship explicitly for each function, so the design choice is a lot clearer. Hope that clears things up!