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API Student Growth
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This report shows CPS's Student Growth Metric, the Academic Progress Indicator (API). The base metric used to measure academic growth within the API is the change in Normal Curve Equivalent (NCE) scores. An NCE is a standardized assessment score that ranges from 0 to 100, where a score of 50 corresponds to the state average. NCE scores are computed for each student using the Illinois Assessment of Readiness (IAR) scores in grades 3-8 and SAT/ACT sequence of assessments in grades 9-11. The base API metric is defined as the change in NCE points for individual students from one year to the next.

NCEs have an equal interval scale, unlike percentiles, so they can be averaged and compared across tests, grades, subjects, and school years to provide a robust measure of student growth.
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Variable NameDescription
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School NameName of the CPS school where the student tested. Note that Virtual Academy students test at their brick and mortar school.
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School CodeNumeric school code of the CPS school
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School YearSchool year for which this data is reported
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MetricIndicates the Student Growth (ELA, MATH)
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CategoryReporting category: ALL, Economic Disadvantage, English Learner Status, Gender, IEP Status, Race/Ethnicity, Temporary Living Situation Status.
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Student GroupFor each reporting category, the specific student group (e.g. Female, Male, Nonbinary) for the data row.
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Student CountThe count of tested students.
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APIAPI is the student growth measure, and represents the Change in a student's achievement (based on NCE scores) between the current and previous year.
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EffectSizeEffect Size is the difference between Student Growth and Typical Growth across the state for students with similar starting achievement.
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EffectSizeTextThis field provides an interpretation of Effect Size, broken down by the following groups:
Higher than Typical Growth (Effect Size is +0.30 or above),
Typical Growth (Effect Size from -0.29 to +0.29),
Lower than Typical Growth (Effect Size from -0.30 to -0.59),
Significantly Lower than Typical Growth (Effect Size is -0.60 or below)
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NotStatSignficant This field indicates if the Effect Size is not statistically significant. The Effect Size will not be statistically significant if the difference between CPS growth and typical state growth is too small, or if the number of students included in the calculation is too small. 1=Yes, 0=No
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NotesNotes for when data is not reported. Rows with <10 students in the denominator will not have data reported. This column indicates when that is the case.
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