Ex_1_2_18.md

title	date	draft	tags	categories
算法4 Java解答 1.2.18	2019-02-22 07:35:22 +0800	false	JAVA	技术 归档

1.2.18

问题：

Variance for accumulator. Validate that the following code, which adds the methods var() and stddev() to Accumulator, computes both the mean and variance of the numbers presented as arguments to addDataValue()

分析：

递推均值、递推方差公式：

参考：

利用递推快速计算方差和均值