NO.PZ201709270100000106
问题如下:
6.Based on Exhibit 2, the degrees of freedom for the t-test of the slope coefficient in this regression are:
选项:
A.48.
B.49.
C.50.
解释:
A is correct.
The degrees of freedom are the number of observations minus the number of parameters estimated, which equals two in this case (the intercept and the slope coefficient). The number of degrees of freedom is 50− 2 = 48.
老师关于自由度的判断,我看了一些你给其他同学的答疑,和这道题的解析
我总结一下结论,您帮忙看下是否正确
就是在计算斜率系数的t 检验,和计算截距系数的t检验时候,自由度都为 n-k-1, 因为是一元,所以自由度为 n-2,多元的话自由度依然是 n-k-1
而在ANOVA表当中,计算SSR的自由度则为 K,SSE的自由度为 n-k-1, SST的自由度为 n-1
麻烦老师看下上述结论是否正确,