The observed association between interventions and outcomes, or a statistic to summarise the strength of the observed association.

In general terms, an effect size is a statistical measure of the size of a relationship that is being investigated. For example, when two groups (such as a treatment group and a control group) are bei [..]

The size of an effect in a study. See combing effect sizes- statistical significance.

This is a statistical term that refers to the size of a relationship between two variable. Sometimes effect size is known as treatment effect because it is often used when dealing with therapeutic int [..]

The difference between two population means divided by the standard deviation of either population, assuming that both groups have the same standard deviation.

A measure of the strength of the effect of the predictor (or independent) variable on the outcome (or dependent) variable.

A way to compare the scores for two groups or for the same group under two different conditions that takes into account how variable the scores are; the standardized mean difference is the most common [..]

A way to compare the scores for two groups or for the same group under two different conditions that takes into account how variable the scores are; the standardized mean difference is the most common [..]

Effect Size is a way of quantifying the effectiveness of a particular intervention. It allows us to move beyond the simple 'Does it work or not?' to the far more sophisticated,

In the context of juvenile justice research, effect size is a measurement that quantifies the amount that a program has been shown to change an outcome (such as recidivism) for the program participant [..]

The effect size is an estimate of the size and direction of a change caused by an intervention. The value of an effect size is that it quantifies the effectiveness of a particular intervention, relative to a comparison group – essentially a measure of the extent

A measure of the magnitude of a policy or program’s effectiveness. In cost-benefit analysis, the effect size is a key input for calculating the costs and benefits a policy generates.

1. A generic term for the estimate of effect of treatment for a study. 2. A dimensionless measure of effect that is typically used for continuous data when different scales (e.g. for measuring pain) are used to measure an outcome and is usually defined as the difference in means between the intervention and control groups divided by the standard de [..]

Although various types of effect sizes may be reported in the results section of a research report, one basic form of an effect size refers to the degree or extent of influence or effect of the independent variable on the dependent variable in a study. Accordingly, it may be quantified as (a) the proportion of variation on the dependent variable me [..]