Graduation rates among the comparison districts are very high. Andover (thick blue line) has a comparable four-year graduation rate to most of its peer districts. There has been no significant change over time (2010-2019). Significantly more Andover students graduate in four years than those in Arlington and Chelmsford (*) and significantly fewer than those in Needham, Wellesley and Westwood (+) over the ten year period (2010-2019; p<=.05).