Dear Statalisters,

A few questions have got me confused and I am sure most of you know the answers.

1. I want to test the regression model for sample selection bais but I have a cont. dependent variable (e.g ROA). What i have understood so far that Heckman model is only applicable if the model is tested using probit? Is my understanding of the Heckman correct?

2. Which method i must try for sample selection bais considering i have only continous variable and i cannot run probit, ? The alternatives.

3. Can Heckman model be applied to different(all) models?

Thanks and have a nice day.

Irfan.


p.s. I have a panel dataset.