Day 1: Interquartile Range

HackerRank 10 days of statistics

: Day 1 note taking Interquartile Range

Quartiles = 3 points which divide an array into 4 equal range.

quartile
Q1	Q1 >= 25% of the data
Q2	Q2 >= 50% of the data
Q3	Q3 >= 75% of the data
Interquartile Range	Q3-Q1

Interquartile Range(사분위 범위): the difference between first(Q1) and third(Q3) quartiles.

def median(arr):
    N = len(arr)
    if N%2==0:
        return (arr[(N//2)-1]+arr[N//2])/2
    return arr[N//2]

def interquartile(arr):
    N = len(arr)
    Q1 = median(arr[:N//2])
    Q2 = median(arr)
    if N%2 == 0:
        Q3 = median(arr[N//2:])
    else:
        Q3 = median(arr[(N//2)+1:])
    return Q3 - Q1

S = sorted(map(float,input().split()))
IQR = interquartile(S)