High-value-added teachers raise students’ scores, but the gains fade in later years, complains economist Jesse Rothstein in a review of a recent Gates Foundation report.
Duh, responds Stuart Buck.
Would anyone suggest that the value of vigorous exercise is somehow discredited because a vigorous exercise program has the most effect only in the year that it is actually followed, but its effects mostly disappear after the individual stops exercising?
. . . Would anyone be surprised to find that a healthy diet enabled people to lose weight only when they actually followed the diet, but didn’t have permanent effects that allowed people to quit the diet and eat whatever they wanted therafter?
Well, yes. My ex-husband, who’s turning 60 in a few days, lost a lot of weight about 10 years ago through diet and exercise. Now he’s gained some back and complains that he needs four blood-pressure medications. I suggested he walk every day for exercise.
“I have an app for that!” he said.
“Do you walk?”
“No. But I have the app.”