restriction of range: what it is and why it matters
freddiedeboer.substack.com
Let's imagine a bit of research that we could easily perform, following standard procedures, and still get a misleading result. Say I'm an administrator at Harvard, a truly selective institution. I want to verify the College Board's confidence that the SAT effectively predicts freshman year academic performance. I grab the SAT data, grab freshmen GPAs, and run a simple Pearson correlation to find out the relationship between the two. To my surprise, I find that the correlation is quite low. I resolve to argue to colleagues that we should not be requiring students to submit SAT or similar scores for admissions, as those scores don't tell us anything worthwhile anyway.
restriction of range: what it is and why it matters
restriction of range: what it is and why it…
restriction of range: what it is and why it matters
Let's imagine a bit of research that we could easily perform, following standard procedures, and still get a misleading result. Say I'm an administrator at Harvard, a truly selective institution. I want to verify the College Board's confidence that the SAT effectively predicts freshman year academic performance. I grab the SAT data, grab freshmen GPAs, and run a simple Pearson correlation to find out the relationship between the two. To my surprise, I find that the correlation is quite low. I resolve to argue to colleagues that we should not be requiring students to submit SAT or similar scores for admissions, as those scores don't tell us anything worthwhile anyway.