regression diagnostics

a set of graphical and numerical techniques routinely used by researchers to check for violations of assumptions in the application of regression analysis to particular data sets. For example, it is assumed that the relationship between the independent variables and the dependent variable is linear, that the variables have been measured accurately, and that any prediction errors resulting from the regression equation are independent and normally distributed with equal variance and a mean of zero. If the data do not possess such characteristics, the analysis may not be appropriate and thus its results may not be valid. See diagnostics; residual analysis.

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Psychology term of the day

November 28th 2024

cocaine withdrawal

in DSM–IV–TR, a characteristic withdrawal syndrome that develops after cessation of (or reduction in) prolonged, heavy consumption of cocaine. The essential characteristic is depressed mood, sometimes severe, and there may also be fatigue, disturbed sleep, increased appetite, vivid and unpleasant dreams, or psychomotor retardation or agitation, or all of these features. Marked withdrawal symptoms (see crash) often follow an episode of intense, high-dose use. The equivalent term in DSM–5 is stimulant withdrawal. See also substance withdrawal.