What is R-Squared (R^2) ... REALLY? 

Thank you, I appreciate it!

Great idea, Jim. That gives me an idea for a future video, talking about absolute versus squared differences and why we use squared errors. Thanks!

The y-intercept is not shown on the graph at all, because the x axis only goes from 60 to 70. X = 0 is way to the left.

@@briangreco2718 But the regression here is drawn with origin as 0. also the regression line is cutting the Y axis somewhere between 50-100, lets assume 75. so it shows when x=0, y=75, which basically is the intercept. I am a bit confused on this. how is the intercept -500 and the graph shows something else

The graph doesn’t show the x=0, so you are reading the graph incorrectly. The equation is correct and you understand the equation correctly, but you are reading the graph incorrectly. There is no y axis.

Brier score is more specifically for predictions of binary events, but yes they are very similar!