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 (2008-2017). Significantly more Andover students graduate in four years than those in Arlington and Chelmsford (*) and significantly fewer than those in Needham, Westwood and Wellesley (+) over the ten year period (2008-2017; p<=.05). In 2017 Andover ranked fifth in four-year graduation rate (compared to ninth in 2016).