What you do here
When Studara said you had a seven-in-ten chance of recalling something, how often did you? The curve is computed from our own append-only log at request time, with its sample size and date printed beside it — and the metric that failed its bar is on the same page.
How it works
We built a levels-of-response marker for extended answers, measured it against a fixed rubric, and it missed its bar — so it is switched off and the measurement is published. That is the same page as the numbers we are proud of.