Correlation analysis of numerical data in Data Mining
|
A |
B |
|
3 |
1 |
|
4 |
6 |
|
1 |
2 |
Step 1: Find all the initial values
|
A |
B |
AB |
A2=C |
B2=D |
|
3 |
1 |
3 |
9 |
1 |
|
4 |
6 |
24 |
16 |
36 |
|
1 |
2 |
2 |
1 |
4 |
The total number of values (n) is 3.
[quads id=1]
The other values we need are:
ΣA =3 + 4 + 1 = 8
ΣB = 1 + 6 + 2 = 9
ΣAB = 3 + 24 + 2 = 29
ΣC = 9 + 16 + 1 = 26
ΣD= 1 + 36 + 4 = 41
Step 2: Input the Values
(r) =[ nΣAB – (ΣA)(ΣB) / Sqrt([nΣC– (ΣA)2] [nΣD – (ΣB)2])]
r = [3(29) – (8)(9) / Sqrt ([3(26) – (8) 2 ] [3(41)-(9) 2 ])]
r= [87-72 / Sqrt ([78-64] [123 -81])]
r= [15 / Sqrt ([14] [42])]
r=[15 / Sqrt (588)]
r= 15 / 24.24
r= 0.61
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