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In response to the Every Student Succeeds Act, nearly three-fourths of states have adopted chronic absenteeism (CA) as a non-academic accountability metric. Major theoretical assumptions underlying this indicator, however, have never been validated. The current study represents the first effort to test the most basic assumption upon which CA is based—that both excused and unexcused absences are equally detrimental to student outcomes and should be utilized to identify at-risk students. Using the receiver operating characteristic (ROC) methodology, this study presented evidence that only unexcused absences provided diagnostic accuracy for academic risk status for an entire cohort of students in Philadelphia. Theses findings indicate that CA could be a more effective early warning indicator by taking absence types into account.