Amid sexting scandals and tanking test scores, it turns out teenagers may not be doing quite as badly as we thought on one very important measure: graduation rate.

Analysts at the Economic Policy Institute, including Nobel Prize winner James Heckman, issued a scathing statement Thursday calling Education Week magazine’s recent analysis of graduation rates “exceedingly inaccurate.” The magazine’s methods understate graduation rate by 9 percentage points overall, and about 14 points for minority students.