How to use school demographics data

Choose the population before calculating a share

School demographic data describes enrolled students within a stated collection and year. It does not describe every child living nearby or everyone in the surrounding neighborhood. Begin with the school identifier, grade coverage, reporting year, and source definition for each category.

Match the numerator and denominator

If a category contains 120 students out of a compatible total enrollment of 600, its share is 20%. That hypothetical calculation is valid only when both figures cover the same school, grades, and year. Using a subgroup count from CRDC with a newer CCD enrollment total creates a mixed-year percentage.

Not every category can be added

Race and ethnicity categories, disability status, English learner status, and program participation follow different definitions. Some classifications overlap: one student may belong to several program groups. Add categories only when the source defines them as mutually exclusive and collectively appropriate for the total you need.

Preserve missing and protected values

Do not replace an unavailable or suppressed count with zero. Rounded percentages may not sum to exactly 100%. Report coverage and the usable denominator alongside a summary, particularly when comparing small populations. Avoid presenting demographic composition as a school rating or inferring an individual’s characteristics from a school aggregate.

Sources and related measures

Use NCES Common Core of Data files for year-specific enrollment files and CRDC data and collection documentation for collection-specific student and program measures. The Title I guide explains why a funding flag is not an individual income measure. The enrollment trends guide covers consistent populations across years.