The following are my plan:


"Each month, form ten decile portfolios sorted on OIBNUM. Then, calculate the value-weighted and equally-weghted ptf return in the next month (so if you sort on information at time t, calculate the return from t to t+1)."



In the attachment, ret stands for return and val means value.


Thank you very much for your help!!!!!!


PS: you can reply in Chinese, there's no Chinese input in my current computer, sorry for the inconvenience.