题解 | #某类鸢尾花数据方差#
某类鸢尾花数据方差
http://www.nowcoder.com/practice/77ea4f53a45c43ee95d78f513d79496c
注意 np.var 和 pd.DataFrame.var 的区别
- np.var：默认
ddof=0 - pd.DataFrame.var：默认
ddof=1
ddof
"Delta Degrees of Freedom": the divisor used in the calculation is
N - ddof, whereNrepresents the number of elements.
题目输出的结果是 ddof=0
import pandas as pd
import numpy as np
iris = pd.read_csv('iris.csv', sep=',')
virginica = iris[iris['type']=='Iris-virginica']
print(np.var(virginica))
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