Heckman self-selection issue

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michelleli
Posts: 20
Joined: Wed Jul 20, 2011 3:55 pm

Heckman self-selection issue

Postby michelleli » Mon Oct 10, 2011 8:35 pm

Hi,
I am trying to estimate the effect of CEO duality on firm performance using Heckman two-step procedure. The problem I have now is the program shows a message of insufficient number of observations. I am guessing that my sample is too small to produce any results? Total sample is 157 with 150 firms=0 and 7 firms=1.

How could I solve this problem?

Cheers
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