7%

There was some point in junior high school when I stopped understanding math. I kept attending class, did the homework, and got good grades. In high school, I took algebra and geometry and then scored well enough on the PSAT, SAT, and ACT to have been recruited by colleges thousands of miles away from my […]

Fun with Point Biserials

A few weeks ago, I was spending a lot of time analyzing test data, specifically, the p values and pt. biserials of a set of English language arts tests for grades 3 through 11, in order to determine What Went Wrong. In the preponderance of cases, of course, nothing went wrong. The items performed more […]