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<a accesskey="3" href="page.php?w=effect_size&amp;p=2">3.Next</a>
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<p>In <a href="page.php?w=statistics">statistics</a>, an <b>effect size</b> is a quantitative measure of the magnitude of a <a href="page.php?w=phenomenon">phenomenon</a>. It can refer to the value of a statistic calculated from a sample of <a href="page.php?w=data">data</a>, the value of one parameter for a hypothetical population, or the equation that operationalizes how statistics or parameters lead to the effect size value. Examples of effect sizes include the <a href="page.php?w=correlation">correlation</a> between two variables, the <a href="page.php?w=regression_analysis">regression</a></p><p>
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