Dear Sir I have a technical problem on an ordinal probit regression with IV. In the first stage, my dependent variable is dummy variable. I predict this endogenous variable,and the predict value is continuous. However, my model in the second stage is DID model, that is this endogenous variable must be dummy. So, I don?t know how to solve this problem. Thanks LI,Nan Email.liyiyuan at ust.hk Room B301c,UA Tower B Hong Kong University of Science and Technology Clearwater Bay, Kowloon, Hong Kong