AverageMedian [中位数]
# 介绍
统计学上，中位数（英语：Median），又称中央值、中值，是一个样本、种群或概率分布中之一个数值，其可将数值集合划分为数量相等的上下两部分。对于有限的数集，可以通过把所有观察值高低排序后找出正中间的一个作为中位数。如果观察值有偶数个，则中位数不唯一，通常取最中间的两个数值的平均数作为中位数。
# 实现
# JavaScript
/*
* Median: https://en.wikipedia.org/wiki/Median
*
* function averageMedian
* to find the median value of an array of numbers
* the numbers in an array will be sorted in ascending order by the function sortNumbers
* if the length of the array is even number, the median value will be the average of the two middle numbers
* else if the length of the array is odd number, the median value will be the middle number in the array
*/
const averageMedian = (sourceArrayOfNumbers) => {
let numbers = [...sourceArrayOfNumbers]
let median = 0
const numLength = numbers.length
numbers = numbers.sort(sortNumbers)
if (numLength % 2 === 0) {
median = (numbers[numLength / 2 - 1] + numbers[numLength / 2]) / 2
} else {
median = numbers[(numLength - 1) / 2]
}
return median
}
const sortNumbers = (num1, num2) => {
return num1 - num2
}
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
# 参考
编辑 (opens new window)
上次更新: 2022/10/18, 22:58:49