Nice, I presume the dependent variable is binary, implying a logit/probit model? I don't really get why 3 different stat tools were used, ie Stata, R and SAS...

Nice, I presume the dependent variable is binary, implying a logit/probit model? I don't really get why 3 different stat tools were used, ie Stata, R and SAS... R seems indeed plenty sufficient, or even Stata.