[R] Propensity score and three treatments

[Giovanni Parrinello]

Dear All,
I would like to find something ( references, code,..)  to implement a
comparison of three
treatments in an observational study using the 'Propensity Score'.
Any help is much appreciated. Thanks!
Giovanni

-- 
dr. Giovanni Parrinello
Department of Biotecnologies
Medical Statistics Unit
University of Brescia
Viale Europa, 11 25123 Brescia
email: parrinel at med.unibs.it
Phone: +390303717528
Fax: +390303717488