[Limdep Nlogit List] introducing socio-economic characteristics in binary choice experiments

[Rady Talaat]

Hello,
For the binary unlabeled experiments, how can I incorporate the individual characteristics in the model? Although they may be introduced as interactions with the attributes to avoid hessian singularities, this inclusion of the separate attributes along with their interaction is likely to induce multicollinearity.   
Cheers,
Rady
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