第二種の過誤
Meanings
1
type II error; false negative
In statistics, the error of failing to reject a false null hypothesis; contrasted with 第一種の過誤 (type I error).
See also: 第一種の過誤
A type II error is the mistake of concluding there is no difference when there actually is one.
With a small sample size, the probability of a type II error increases.