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Logistic regression problem: propensity score matching

1) Why are you using multinom when this is not a multinomial logistic 
regression?  You could just use a binomial glm.

2) The second argument to predict() is `newdata'.  `sample' is an R 
function, so what did you mean to have there?  I think the predictions 
should be a named vector if `sample' is a data frame.

3) There are many more examples of such things (and more explanation) in 
Venables & Ripley's MASS (the book).
On Wed, 4 Jun 2003, Paul Bivand wrote:

            
You asked for `probs', so you got probabilities.
what is `it'?
No.