Students who attend school regularly have been shown to achieve at higher levels than students who do not have regular attendance. ... In eighth grade, this pattern was even more apparent and, by ninth grade, attendance was shown to be a key indicator significantly correlated with high school graduation.

Do absences lower your grade?

He found that the fewer absences a student had during the semester, the higher the student's grade point average. Since Jones's study, a multitude of research studies have also found that class absence is negatively associated with course grade. ... They found average attendance to be higher than in Romer's study at 89%.

Does attendance affect test scores?

Student absences have a more significant effect on test scores. A one-day increase in absences in a given grade in a given school decreases math scores by 0.02 standard deviations. An individual student's absence decreases his math score by 0.008 standard deviations.