求助stata command

问题一

我已经得到了持有期每周的回报率，但是我想进一步得到持有期平均每周回报率，得出的回报率应该是一串数列的，就像week1/1, week1+week2/2, ......., week1+week2+......+weekn/n.

问题二:

我想使用Posterior Odds Ratio to 研究哪个模型 (CAPM and APT) 更有效. Posterior Odds Ratio的公式是

                               ,where ESS is the error sum ofsquares, N is the number of observations, and k is the dimension (i.e., thenumber of independent variables) of respective models. 谢谢