Start with the exact discipline measure
A count of students receiving a suspension is different from a count of suspension incidents. One student may be involved in more than one incident or category. Read the item definition in CRDC data and collection documentation before adding categories or calling a total “students.” K12 Atlas v2026.07 uses CRDC SY 2021–22 for this topic.
Calculate a rate with a matching denominator
For a student-based measure, divide the reported student count by the matching enrollment and multiply by 100. For subgroup analysis, use that subgroup’s enrollment from the same reporting period. Schoolwide enrollment is not the correct denominator for a subgroup participation rate.
A worked comparison
Hypothetically, 40 students receiving a specified action among 2,000 enrolled students is 2%; 40 among 200 is 20%. That comparison is meaningful only if both rows use the same student-based definition and time period. If 40 represents incidents instead, label the result incidents per 100 students, not the percentage of students affected.
Do not add overlapping categories
A student can appear in more than one reported discipline category. Adding categories without a documented unique-student total can double-count people. Keep unavailable, suppressed, and zero values distinct; absence of a usable record is not evidence that no action occurred.
What a comparison can establish
Reported differences can identify questions for local records review. They do not by themselves establish causes, policy effectiveness, or school climate. Compare like populations and ask whether reporting rules changed. The discipline summary and CSV provide release-level totals; the CRDC guide explains joins and collection limits.
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