Section06_矩

  1. XXkk 阶原点矩 EXkEX^{k}
  2. XXkk 阶中心矩 E(XEX)kE(X-EX)^{k}
  3. X,YX,Yk+k+\ell 阶混合原点矩 EXkYEX^{k}Y^{\ell}
  4. X,YX,Yk+k+\ell 阶混合中心矩 E(XEX)k(YEY)E(X-EX)^{k}(Y-EY)^{\ell}

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