Residual Plots
Posted by Reversearp
It’s nice to have the calculator do most of the work for you when it comes to residual plots but don’t forget that I will expect you to be able to create a residual plot by hand. Since you already know how to calculate the coefficient of determination by hand this shouldn’t be an issue – just create a graph of the the residuals versus the x – values.
We also mentioned today that whenever you run regression on your calculator, the calculator automatically computes the residuals and stores them in a new list called RESID. You can access that list by going to 2nd STAT, then scrolling down until you see it.
Another cool time saver is accessing the actual regression equation which your calculator stores automatically also. You can find it by going to VARS, then down to STATISTICS, then over to EQ, then down to RegEQ. You could use this to store the regression equation in Y= if you forgot to do it automatically when you ran the regression.
