Yes I'm back, I dedicated this Christmas month to renew my R knowledge and to compare its usefulness with SPSS 14.0 and mintab 16.
I intended to post question here instead of other ways (you know) in the hope of drawing local R users together and I sincerely long for future meetings.
Hong, thank you for your suggestion, mantelhaen.test() is great for it provides CI and if you find the crude ORs confusing. BTW, for the susceptibility of being a confounder, would you suggest any build-in homogeneity test like Tarone's test in 'lawstat'?
s