DF for parameter estimate in nested logit model

[deleted_user]

Briefly, as I get the result from "Proc mdc" for a nested logit model for most of the parameter estimates the DF is 0 "instead of 1" and there is no result for standard error and t value.

can anybody help out?

[sbb]

This item may or may not be applicable to your situation.

SN-009465 ***Alert Note***
Nested logit parameters estimates equal to zero with zero degrees of freedom

Product: SAS/ETS
Component: MDC procedure
Priority: ALERT

http://ftp.sas.com/service/techsup/tsnews-l/0366.html


http://support.sas.com/rnd/app/papers/mdc.pdf