# Golang : Find correlation coefficient example

Below is an example of Golang code to find the strength of relation between two given variables or correlation coefficient. For financial analysis, it is useful in finding out if a variable has negative or positive correlation.

From investopedia.com:

A correlation of -1.0 shows a perfect negative correlation, while a correlation of 1.0 shows a perfect positive correlation. A correlation of 0.0 shows zero or no relationship between the movement of the two variables.

Here you go!

```
package main
import (
"fmt"
"math"
)
func main() {
X := []int{15, 18, 21, 24, 27}
Y := []int{25, 25, 27, 31, 32}
// Size of X array.
n := len(X)
// Get the strength of relation between two variables - X and Y
fmt.Println(correlationCoefficient(X, Y, n))
}
func correlationCoefficient(X []int, Y []int, n int) float64 {
sum_X := 0
sum_Y := 0
sum_XY := 0
squareSum_X := 0
squareSum_Y := 0
for i := 0; i < n; i++ {
// sum of elements of array X.
sum_X = sum_X + X[i]
// sum of elements of array Y.
sum_Y = sum_Y + Y[i]
// sum of X[i] * Y[i].
sum_XY = sum_XY + X[i]*Y[i]
// sum of square of array elements.
squareSum_X = squareSum_X + X[i]*X[i]
squareSum_Y = squareSum_Y + Y[i]*Y[i]
}
// use formula for calculating correlation
// coefficient.
corr := float64((n*sum_XY - sum_X*sum_Y)) /
(math.Sqrt(float64((n*squareSum_X - sum_X*sum_X) * (n*squareSum_Y - sum_Y*sum_Y))))
return corr
}
```

Output:

0.9534625892455922

References :

https://www.investopedia.com/terms/c/correlationcoefficient.asp

https://www.geeksforgeeks.org/program-find-correlation-coefficient

https://www.socketloop.com/tutorials/golang-convert-cast-int-to-float-example

#### See also : Golang : Calculate Relative Strength Index(RSI) example

Tags : golang math-sqrt correlation-coefficient

##### By Adam Ng(黃武俊)

IF you gain some knowledge or the information here solved your programming problem. Please consider donating to the less fortunate or some charities that you like. Apart from donation, planting trees, volunteering or reducing your carbon footprint will be great too.

#### Tutorials

+2.8k Swift : substringWithRange() function example

+6.5k Swift : Convert (cast) Int to int32 or Uint32

+1.6k Unix/Linux : How to get own IP address ?

+1.8k Golang : Create zip/ePub file without compression(use Store algorithm)

+2.8k Javascript : How to check a browser's Do Not Track status?

+1.2k PHP : Proper way to get UTF-8 character or string length

+4.1k Golang : Bcrypting password

+1.5k Golang : Denco multiplexer example