About this resource

    Type of resources
    Lesson
    Education level(s)
    College / Upper Division (Undergraduates)
    Primary user(s)
    Student, Teacher
    Subject area(s)
    Math & Statistics, Social Science
    Language(s)
    English
    Last updated
    9 November 2026
    Lesson

    Defining Effect Sizes

    By Matthew B. Jané, Qinyu Xiao, Siu Kit Yeung, Flavio Azevedo, Mattan S. Ben-Shachar, Aaron R. Caldwell, Denis Cousineau, Daniel J. Dunleavy, Mahmoud Elsherif, Tylor J. Harlow, Blair T. Johnson, David Moreau, Paul Riesthuis, Lukas Röseler, James Steele, Felipe F. Vieira, Mircea Zloteanu, Gilad Feldman

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    Level College / Upper Division (Undergraduates) · For Student, Teacher · Language English

    Abstract

    This guide offers detailed instructions for calculating effect sizes and confidence intervals, which are frequently utilized in the social and behavioral sciences. It provides background information, useful tools, and advice for situations in which data is lacking or insufficient. The site, which is frequently updated to reflect advancements in open science, has a strong emphasis on the usage of R and reproducible research techniques.

    Keywords Collaboration · Confidence Interval · Effect Size · Open Educational Resource · Open Scholarship