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Comparative Growth

Comparative Growth measures the progress of a teacher’s students on a given assessment compared to all other students within the same school district with the same or similar starting score. Comparative Growth relies on the use of standardized assessments administered in the district in certain grades and subjects and is computed by the HISD Research and Accountability department using two consecutive years of students’ scores. A Comparative Growth Model has been in use in HISD since the 2010–2011 school year.

  • 2010–2011 through 2013–2014: Comparative growth calculated using Stanford/Aprenda for:
    • Grade 2 Language Arts
    • Grades 2–8 Reading
    • Grades 2–8 Math
    • Grades 5 & 8 Science
    • Grade 8 Social Studies
  • 2014–2015: Comparative growth calculated using the Iowa/Logramos for:
    • Grade 2 Language Arts
    • Grades 2–8 Reading
    • Grades 2–8 Math
    • Grades 5 & 8 Science
    • Grade 8 Social Studies
  • 2015–2016 through 2018–2019: Comparative growth calculated using the STAAR/EOC for:
    • Grades 4–8 Reading
    • Grades 4–8 Math
    • Grades 4 & 7 Writing
    • Grades 5 & 8 Science
    • Grade 8 Social Studies
    • Algebra I
    • English I & II
    • Biology
    • US History
  • 2021-2022: Comparative growth calculated using the STAAR/EOC for:
    • Grades 4–8 Reading
    • Grades 4–8 Math
    • Grades 5 & 8 Science
    • Grade 8 Social Studies
    • Algebra I
    • English I & II
    • Biology
    • US History
  • 2010–2011 through 2018–2019 and 2021-2022: Comparative growth calculated using the TELPAS reading for:
    • Grades 3–8
  • 2019–2020 through 2020–2021: Due to COVID-19 school closures, the cancellation of STAAR exams, and the unavailability of testing data, no Comparative Growth measures were calculated for either STAAR/EOC or TELPAS.

Calculation of Comparative Growth is a three-step process:

Step 1: Sort students into district comparison groups, or cohorts, using the previous year test scores.

Step 2: Percentile rank students’ current year test scores within each cohort to determine students’ Comparative Growth scores.

Step 3: Calculate the median of a teacher’s students’ Comparative Growth scores to determine the teacher’s Comparative Growth score.

Comparative Growth does:

  • Measure the progress of a teacher’s students within HISD who start at the same test score level;
  • Measure growth, not attainment;
  • Rely on two years of data from assessments; and
  • Identify teachers’ impact on student learning relative to other teachers whose students performed similarly the previous year.

 

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