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Version 1.1 – Updated August 2021

Modifying school calendars / timetables

Overview

  • Influence: Modifying school calendars / timetables
  • Domain: Classroom
  • Sub-Domain: Class composition effects
  • Potential to Accelerate Student Achievement: Likely to have a small positive impact
  • Influence Definition: This includes changing the school terms, semesters, vacation times, times of day for starting and closing school, block scheduling or various time spans for classes.

Evidence

  • Number of meta-analyses: 2
  • Number of studies: 94
  • Number of students: 88,000
  • Number of effects: 1,288
  • Effect size: 0.09

Meta-Analyses

Meta-Analyses
Journal Title Author First Author's Country Article Name Year Published Variable Number of Studies Number of Students Number of Effects Effect Size
Review of Educational Research Cooper, Valentine, Charlton & Melson USA The effects of modified school calendars on student achievement and on school and community attitudes. 2003 Modified school calendar vs. traditional calendar 47 44,000 644 0.09
Review of Educational Research Cooper, Valentine, Charlton & Melson USA The effects of modified school calendars on student achievement and on school and community attitudes. 2003 Modified school calendar vs. traditional calendar 47 44,000 644 0.09
TOTAL/AVERAGE 94 88,000 1,288 0.09

Confidence

The Confidence is the average of these four measures, each divided into five approximately equal groups and assigned a value from 1 to 5 based on the following criteria:

  • Number of Meta-analyses
    • 1 = 1
    • 2 = 2–3
    • 3 = 4–6
    • 4 = 7–9
    • 5 = 10+
  • Number of Studies
    • 1 = 1–10
    • 2 = 11–50
    • 3 = 51–200
    • 4 = 201–400
    • 5 = 400+
  • Number of Students
    • 1 = 1–2,500
    • 2 = 2,501–10,000
    • 3 = 10,000–20,000
    • 4 = 20,000–100,000
    • 5 = 100,001+
  • Number of Effects
    • 1 = 1–100
    • 2 = 101–300
    • 3 = 301–600
    • 4 = 601–1,200
    • 5 = 1,200+
Confidences
Number of Meta-Analyses Number of Studies Number of Students Number of Effects Overall Confidence
Confidence Factor 2 3 4 5 4
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