LINKS Effect Size Charts
The following charts display effect sizes for programs with positive, statistically significant, and sizeable impacts on select outcome areas. Although effect sizes are not the only way to judge the merit of a program (and can only be properly interpreted with an understanding of implementation and evaluation context), they are a convention commonly used to evaluate the magnitude of a program’s impact on a given outcome.
How to Read these Charts
General: Effect sizes for each program are displayed using line graphs, with the effect size magnitude on the y axis and the age range of the evaluated population on the x axis. Each effect size is labeled with a program name that is hyperlinked to a program description and codes/abbreviations to indicate the outcome area(s) for which the effect size was estimated. A key to these abbreviations is provided on each chart. The programs, effect sizes, and evaluated age ranges in these charts were last updated in the summer of 2012. Updates will be made periodically, as feasible.
Researchers/Evaluators: These charts present Cohen’s d effect sizes – standardized effect size used most often for continuous outcomes (counts or averages, for example). Effect sizes for outcomes that were originally measured using a yes/no response were converted into a Cohen’s d so that all effect sizes could be presented on a similar scale.
Practitioners/Policymakers: Effect sizes are most often shown in tables. We present them graphically, to maximize the utility of this resource across different settings.
Effect Size Charts
Programs for Adolescents and Young Adults (with Manuals) with Sizeable Impacts. Presents social development programs with modest to large effect sizes for adolescents and young adults. All have manuals to guide implementation.
Programs for Children (Ages 6 to 11), with Sizeable Impacts. Presents social development programs with modest to large effect sizes for elementary school age children, regardless of whether they have manuals to guide implementation.
Programs for Young Children (Birth to Age 5), with Sizeable Impacts. Presents social development programs with modest to large effect sizes for children from birth to age 5, regardless of whether they have manuals to guide implementation.
Programs with Positive Cost-Effectiveness Data and Sizeable Impacts (All Ages). Presents cost-effective social development programs with modest to large effect sizes for all ages. All programs have manuals to guide implementation and all have positive cost-benefit impacts.