noncentral distribution

a distribution in which the noncentrality parameter is not equal to zero: In statistical significance testing, such a distribution is obtained when the null hypothesis under test is false. The noncentral version of a distribution has a different mean, skewness, and variance (among other properties) than its corresponding central distribution, as well as a larger proportion of numbers beyond the critical values. For example, the chi-square distribution, F distribution, and t distribution all have corresponding noncentral versions signified by a noncentrality parameter that is not equal to zero.

Browse dictionary by letter

a b c d e f g h i j k l m n o p q r s t u v w x y z

Psychology term of the day

May 9th 2024

perceptual distortion

skewed perceptual experience. Examples include the distorted images produced by dreams or hallucinogenic drugs, geometric illusions (e.g., the Müller-Lyer illusion), visions occurring in states of sensory deprivation or dehydration, and distortions produced by modifying auditory stimuli. Perceptual distortion may also occur as a consequence of acquired brain injury. See also metamorphopsia.