方差的含義

原創 velanjun 2020-02-23 23:10

1）公式 先平均，再算差，再平方，再平均
2）爲什麼要平方，因爲每個數和平均數的差有正有負，而我們只關心差的絕對值，但是用絕對值會使計算繁瑣，所以用平方
3）方差是考察數據的波動性的，方差小就說明數據比較穩定，方差大就是波動性比較大

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