M1 · The Best Straight Line
R Squared and Its Traps
Pick the right regression score, and say what a high R squared does not prove.
The delivery model's mean squared error is 1.065. But 1.065 of what? Minutes squared. Nobody has an intuition for minutes squared. Take the square root and you get 1.032, in minutes. That is the root mean squared error, and it is the number to report.