effect size

any of various measures of the magnitude or meaningfulness of a relationship between two variables. For example, Cohen’s d shows the number of standard deviation units between two means. Often, effect sizes are interpreted as indicating the practical significance of a research finding. Additionally, in meta-analyses, they allow for the computation of summary statistics that apply to all the studies considered as a whole. See also statistical significance.

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Psychology term of the day

January 30th 2025

Katz Index of Activities of Daily Living

an observer-based measure of the functional status of older adults and individuals with chronic disorders. An individual is rated on the degree of assistance required to perform six basic functions: bathing, dressing, feeding, toileting, transferring, and continence. Baseline measurements provide useful feedback when compared to periodic or subsequent measurements. Also called Katz Index of Independence in Activities of Daily Living. [originally developed in 1963 by Sidney Katz (d. 2012), U.S. physician and geriatrician]