[R] How can I do a generic specification in multiple logistic regression

[Benjamin Geckle]

I use the function multinom to estimate a multiple logistic regression. 
but I need one coefficient as generic. How can I do this? Or is it 
possible to do this with an another function?



As example  this is what I get:


Call:

multinom(formula = choice ~ time + costs, data = DATA)



Coefficients:

   (Intercept)        time             costs

1    4.79            -0.28          -3.97

2   -3.30             0.053         0.59

3    2.10            -0.048        -0.65



But I would like to get the costs parameters as generic attribute, so 
that I have the following result:

Coefficients:

   (Intercept)        time           costs

1    4.79            -0.3            -1.8

2   -3.36             0.4            -1.8

3    2.10            -0.5            -1.8




Thank you for you help.

Best Regards

Benjamin