大家好，新人初来乍到，有个问题想请教一下。
求 年龄条件下的LIFESAT 的方差，使用 VAR(G2:G1661,"0",B2:B1661) 不知道是不是对。
还有我在做一个计量经济学的作业，有一道题是这样的：
Calculate the sum of squared residuals for the estimated multiple regression model in Part (C).Choose some other estimator or make up any other set of estimates for your coefficients (i.e. change ̂ ̂ ̂ ̂ ̂ ̂ and ̂ ). Re-calculate the new sum of squared residuals based on your new coefficients.What can you conclude about the original sum of squared residuals and the new sum of squared residuals?
我实在是没有理解，不知道哪位能帮忙解答一下。