[trendia]

I was converting her text into math-ish notation. She's saying that

P(SAT Score > 700 | 1970) > P(SAT Score > 700 | 1980)

is inaccurate, and that we should instead use:

P(SAT Score > 700 | cohort, 1970) ~ P(SAT Score > 700 | cohort, 1980)