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WAHEGURU….!

## Let’s have fun with Correlation:-O

March 4, 2017

Posted by on Ok have some fun first. đ

Whenever you will read any post or paper related to Machine-Learning or Data-Science you will get word ‘Correlation’ many times and how it’s value is important in your model Building.

A simple definition of Correlation: A mutual relationship or connection between two or more things. (that’s layman’s definition and It should be enough most of the times đ )

Coefficient of CorrelationÂ is just an integer, From which we understand how two or more things

are related to each-other. As we discussedÂ Coefficient of Correlation is an integer so it could be +ve or -ve and value of correlation decides how two data-sets effect each other.

Following two images tell lot about Correlation and it’s Value.

Coefficient of CorrelationÂ between range -0.5 to +0.5 is not that valuable by why and how we calculate correlation?

What is Covariance ?

Now if you still feel that something is really missing we should talk about Variance:

Let’s Remove Co from Covariance.

Variance is Measurement of randomness. So How you would calculate Variance of Data?

Give me data:

Data = [4,5,6,7,12,20]

I will find means and subtract it from each individual- Isn’t that Mean-Deviation ? đ OMG!

Have a look at the following Picture:

Let’s wait for stuff like:

Coefficient of determination, Probable Error and interpretation.