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# Kendall Coefficient

Unsolved
###### Prob. and Stats

Difficulty: 2 | Problem written by Junaid Ahmed
Kendall's Coefficient is used to calculate the agreement between different variables or data points, for example for measuring agreement between raters. If the value of this coefficient is 0 then we can say that there is no agreement. If the value is 1 then the data points have the same value.

The mathematical equation of the Kendall coefficient is:

$$KD = \frac{S}{(n^{3}-n)\frac{k^{2}}{12}}$$

$$S= \sum [d - (\frac{d}{N})]^{2}$$

d is the data points

N is the number of items

k is the number of clusters

n is the number of ranked items

Write a Python function to find the Kendall coefficient for 3 data points corresponding to rating values for a single variable.

##### Sample Input:
<class 'int'>
d1: 3
<class 'int'>
d2: 5
<class 'int'>
d3: 7
<class 'int'>
N: 10
<class 'int'>
n: 10
<class 'int'>
K: 4

##### Expected Output:
<class 'float'>
0.1380681818181818

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