The high school graduation rate, also known as the four-year adjusted cohort graduation rate, is the number of students who graduate in four years with a regular high school diploma taken as the percentage of the number of students who form the adjusted cohort for the graduating class. For any given cohort, students who are entering grade 9 for the first time form a cohort that is subsequently adjusted by adding any students who transfer into the cohort later during the next three years and subtracting any students who transfer out, emigrates to another country, or dies during that same period.

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