So this is equal to m minus 1, plus mn minus m.
所以这等于 m 减 1,加上 mn 减 m。
Then we have a schwa again, but when the schwa is followed by n, we don't really hear it, mn, mn, mn.
然后我们又有一个 schwa,但是当 schwa 后面跟着 n 时,我们并没有真正听到它, mn,mn,mn。
This is equal to mn minus 1 degrees of freedom, which is exactly the total degrees of freedom we had for the total sum of squares.
这等于 mn 减去 1 个自由度,这恰好是总平方和的总自由度。
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