search for: graduent

...ing sample selection models, old and new versions of R work equally well (I write my own programs and do not use ones from AER or sampleSekection). For more complicated models the newer R would converge with not-so-nice gradients while R-3.0.3 would still do nicely (good gradient). I use numerical graduent of course. I wonder whether numerical gradient routine were revised at the time of transition from R-3.0.3 to newer. Not knowing how different your versions of maxLik are between, I will try as I said I would, that is, use new version of maxLik from old R and vice versa, and see what happens. Sent...

...sions of R work equally well (I write my own > programs and do not use ones from AER or > sampleSekection). For more complicated models the newer R > would converge with not-so-nice gradients while R-3.0.3 > would still do nicely (good gradient). I use numerical > graduent of course. I wonder whether numerical gradient > routine were revised at the time of transition from > R-3.0.3 to newer. As R-core member, particularly interested in numerical accuracy etc, I'm also interested in learning what's going on here. I think we (R core) have never...

Hi Steven Which optimisation algorithms in maxLik work better under R-3.0.3 than under the current version of R? /Arne On Thu, 8 Oct 2020 at 21:05, Steven Yen <styen at ntu.edu.tw> wrote: > > Hmm. You raised an interesting point. Actually I am not having problems with aod per se?-it is just a supporting package I need while using old R. The essential package I need, maxLik, simply