求助计量经济题2道

麻烦大婶帮忙两道剂量经济的题目， 写作业写的已经头晕眼花！谢谢各位！我没有很多论坛币， 只有这些，感谢大神门！！1 Suppose that the classical regression model appies to a situation at hand, but the true value of the constant is zero:B1=0, compare the SSE of OLS estimator b to SSE of another LS estimator b estimated with no constant.

2 Consider the OLS regression estimator b. now repeat the same regression with demeaned dependent and independent variables, that is average of a variable is substracted from all data points of that variable. Now repeat the regression with the estimator C
A. Derive the difference of SSEs from the two regressions.
B, What is the value of C1

没人吗。。。。。。

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