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Item A novel method for testing goodness of fit of a proportional odds model:an application to an AIDS study(National Science Foundation:Colombo, 2008-6) Abeysekera, W.W.M.; Sooriyarachchi, R.Item Use of Schoenfeld's global test to test the proportional hazards assumption in the Cox proportional hazards model:an application to a clinical study(National Science Foundation:Colombo, 2009-3) Abeysekera, W.W.M.; Sooriyarachchi, M.R.