Batsell and Polking (1985) developed one of the important choice model
s that address the problem of independence from irrelevant alternative
s. In this note, we propose an estimation method that directly estimat
es Batsell and Polking's model. Compared to the indirect estimation me
thod suggested by Batsell and Polking, the direct method is simpler, m
aking the BP model more accessible to potential users.