Calculating R-squared | Regression | Probability and Statistics | Khan Academy

And the 12% is explained by what? Where come the 12% from?

@norwayte The 12% is unexplained. Real world examples are important here. Suppose x is height of a person and y is weight. Then 88% of the variation in weight can be explained by knowing someone's height. The other 12% is explained by either something else(diet, genetics, etc.), or just randomness (no real cause at all).

Someone told me about the area equation. They mentioned Pi R Squared. This is incorrect. Pi R Round. Cake R Squared. Get it right, people!

Take a drink every time he repeats himself!!!

why is it 41/42?? someone explainnnnnn

what about when the difference between the "best fit" line is much much larger than the mean and the squared error with the line of "best fit" is actually much larger than the squared error with the mean? then you get a negative r squared?

This helps a lot. Thank you very much. I hope I can do the same job if I have enough ability. I will be good if I can get a PhD degree in Engineering.

First year in statistics....do I use parentheses when doing the coefficient of determination? For example, I am confused now because I read that you can't have a negative correlation of determination. For instance, say you had Rxy = -.7....now, would that be like this (-.7)squared, or just -.7 squared...each gives different results....a negative and a positive...but I don't know which one to use? Thanks!

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for a one predictor model should i use R^2 or adjusted R^2

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Amazing job, thanks a lot

i thought I was going insane learning the conditional probability, but this saved my day. More concrete and logical.

Why is the SE error by the line does not describe the error in mean of Y

Here's the question: IS THE ANSWER E?)

Which of the following tells us how strong the relationship is between two variables?


a) the slope of a line


b) the intercept of a line


c) the coefficient of determination


d) the coefficient of correlation


e) both C and D are correct

Sal be hittin those excel shortcuts 😉

why is line and variation in x interchangeable?