Yeah, your kids are fat and lazy

Some earnest busybodies have announced with some fanfare that Canadian kids aren’t active enough, which may well be true. But since statistics is fun, I decided to look up the report itself and run some numbers. Assigning a numerical scale to the letter grades (F=0, D-=1, D=2, …, A=11, A+=12), and running a simple linear regression on the relationship between the government strategy scores and the overall physical activity scores, we get a slope of -0.29 (ρ = -0.16). In other words, ‘better’ government strategy is weakly associated with worse outcomes. Make of that what you will.