Hi, I tried to use S-plus script with R. I thought it was easy because there aren't a lot differences between S-plus and R syntaxe. However, I didn't succeed to use stepwise function in R. I think the best equivalent in R is step, but this function seems not to use same parameters. is there a better equivalent in R ? or package to make stepwise compatible with R ? Thank you for answers Regards, solenne carat student Institut du thorax - Inserm U533 France