What's the Difference Between the Zero and the Zero?

The zero value for a number of variables that we have is a completely meaningless thing. If I have your SAT score, what does it mean to have a zero amount of SAT? But you literally cannot earn a zero on the SAT score. As long as you sign your name, try a problem. A usual standardized solution is all predictors and all outcomes are standardized. One standard deviation unit in your predictor is associated with a gamma standard deviation changing your dependent variable. That's fine if you have continuous on both sides. But what if your predictor is a group variable? Well, what is a standard deviation change in moving from controlled to treatment? You can move to standardizing.