EViews.com

Hi all,
I run a probit model (only with two regressors) and I get the following warning message on the equation output:
"WARNING: Singular covariance - coefficients are not unique
Covariance matrix computed using second derivatives
WARNING: Complete separation detected at estimated parameters (results
may not be valid)"

Why does this happen? which is the problem? Can someone help me?
Thanks in advance.
Anne

Hard to say without seeing the actual workfile. But the following discussion might be helpful: http://forums.eviews.com/viewtopic.php?f=4&t=4257

The manual has (what I hope is) a clear description of the meaning of this warning.