# Golang : Find correlation coefficient example

Tags : golang math-sqrt correlation-coefficient

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.

#### Advertisement

#### Tutorials

+3k Golang : Emulate NumPy way of creating matrix example

+9.9k Golang : Saving private and public key to files

+1.3k Golang : Print instead of building pyramids

+8.1k Golang : http.Get example

+2.3k Golang : Get missing location after unmarshal binary and gob decode time.

+4.6k Golang : Setup API server or gateway with Caddy and http.ListenAndServe() function example

+2k Fix Google Analytics Redundant Hostnames problem

+16.8k Golang : Example for ECDSA(Elliptic Curve Digital Signature Algorithm) package functions

+6.2k Golang : Find network of an IP address

+2.2k Golang : Spell checking with ispell example

785 Golang : How to find out similarity between two strings with Jaro-Winkler Distance?

+3.4k Golang : Embed secret text string into binary(executable) file