Re: [Gretl-users] how to estimate a censored or truncated model?
On Mon, 25 Apr 2011, Qi Shi wrote:
thanks allin. I manage it. However, i think gretl maybe have too
little choices for LDV models. Say, in the duration model, why it
require the users to use log-normal but not normal distribution.
Because durations are inherently non-negative. The normal
distribution is not applicable.
Moreover, it incorprates censored (and truncated?) models into the
duration models...
It doesn't. Duration models are just one particular sub-class of
limited dependent variable (LDV) models: the dependent variable is
limited in that it cannot be negative, and it may be
right-censored (if some "spells" are not finished yet).
Other sorts of LDV models are handled by different estimators:
logit, probit (binary, ordered or bivariate), tobit, intreg
(interval regression), poisson and negbin for count data, and so
on.
Allin Cottrell