A new Stata command to estimate two-part models for mixed discrete-continuous outcomes is now available at SSC/econometrics.it.

In two part models, a binary choice model is estimated for the probability of observing a zero versus positive outcome. Then, conditional on a positive outcome, an appropriate regression model is estimated for the positive outcome.

`twopm`

focuses on continuous outcomes modeled using `regress`

or `glm`

. When the outcome is a count variable, such models are known as hurdle models. Of special note is that `twopm`

allows the user to leverage the capabilities of `predict`

and `margins`

to calculate predictions and marginal effects from the combined first- and second-part models.

It was written together with Partha Deb.

You may install the command by typing

`ssc install twopm`

in your Stata command bar.

HTH,

Federico