Conditional Logit
Posted: Wed May 21, 2014 7:23 am
Hi all,
I have to estimate the parameters of a generalized conditional logit model by maximum likelihood. In the model both dummy and continious variables are present. I have identified the parameters, however the standard errors and probabilities of the coefficients are 'NA'. I get the error: WARNING: Singular covariance - coefficients are not unique. I have identified several combinations of parameters, but it stays the same.
Could anyone help me solving this problem?
Thanks in advance.
Attached, the workfile.
I have to estimate the parameters of a generalized conditional logit model by maximum likelihood. In the model both dummy and continious variables are present. I have identified the parameters, however the standard errors and probabilities of the coefficients are 'NA'. I get the error: WARNING: Singular covariance - coefficients are not unique. I have identified several combinations of parameters, but it stays the same.
Could anyone help me solving this problem?
Thanks in advance.
Attached, the workfile.