error message
Posted: Wed Jul 28, 2010 1:23 am
Hi all
I am estimating an ordered logit model with two lags and when I try to estimate the model it produces an output with the coefficients but then just get N/A for the p-values etc. In the top part of the output it says the following: Warning: singular covariance, coefficients are not unique. When I estimate it at 1 lag or 3 lags then there is no problem, just at two. Can anyone help me with this problem please and how to fix it. Thanks so much!
I am estimating an ordered logit model with two lags and when I try to estimate the model it produces an output with the coefficients but then just get N/A for the p-values etc. In the top part of the output it says the following: Warning: singular covariance, coefficients are not unique. When I estimate it at 1 lag or 3 lags then there is no problem, just at two. Can anyone help me with this problem please and how to fix it. Thanks so much!