Left censored responses in mixed effects models

Bert Gunter <gunter.berton <at> gene.com> writes:

Dear R Fellow-Travellers:

What is your recommended way of dealing with a left-censored response
(non-detects) in (linear Gaussian) mixed effects models?

Your description of the data calls for a tobit model

http://en.wikipedia.org/wiki/Tobit_model

I think you need to take a look in the survival package.

Regards, Gregor