[Limdep Nlogit List] RPL and GMX logit modelling

[Warwick Wainwright]

Dear Nlgoit community,



I have been modelling using an RPL model (one with covariates included, one without) and have done the same using a GMX logit model (one with covariates included, one without) to determine WTP in WTP space.  When I do the modelling the results I get from the models without covariates are similar (i.e. by significance and sign).  But when I contrast the models that have used covariates the RPL and GMX give totally different results.  Just wondering why this might be?  I am a bit stuck on what I should do next....



Many thanks,

Warwick




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