This article was originally published in The Notebook. In August 2020, The Notebook became Chalkbeat Philadelphia.
Understanding the rates
The four-year cohort graduation rates given here were calculated by following the class of 2010, a group of first-time freshman from fall 2006 (the cohort) through their high school years and measuring what percentage earned their diploma by fall 2010.
For the school rates reported here using the School District’s system, students count as graduates or dropouts at the schools where they were enrolled for the first time as ninth graders, even if they transfer to other schools in the District. Students who leave the District (for example, move to another city) are excluded from the rate calculations.