[Limdep Nlogit List] The partial effects in non-linear utility functions in the Ordered Choice models

[Simona Rasciute]

Dear All, 

I am trying to compute partial effects in the Ordered Choice model when the utility function is non-linear, following Greene and Hensher (2009) "Modeling Ordered Choices". For example, the list of explanatory variables includes not only the age of the respondent but also age squared. All estimated partial effects are subject to the single crossing feature (one sign change). Does the single crossing feature have to also apply to the computed partial effects when non-linear variables are included? When I compute the overall partial effect for the age variable, there are two sign changes. 

Thanks a lot for your help.

Kind Regards,
Dr Simona Rasciute
Research Associate

Department of Economics
Loughborough University
Loughborough
Leicestershire
LE11 3TU
Tel: +44(0)1509 223622