(adsbygoogle = window.adsbygoogle || []).push({}); Define "variation" to a beginner

How do you define the word "variation" "variability" to a complete beginner, like myself.

For Example, I understand 'R' explains how strong the linear relationship between the change in X and Y. But sometimes, let's Say R=.91, people will say the linear trend model explains more than 91% of thevariationin sales.

Another Case is the Mean squared error (MSE) is a measure of variability in the forecast errors.

Hope someone can use 'SIMPLE' words to explain it to me.

Thanks a lot!

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# Define variation to a beginner

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