eigenvalue

(symbol: λ) n. a numerical index, commonly used in factor analysis and principal components analysis, that indicates the portion of the total variance among several correlated variables that is accounted for by a more basic, underlying variable or construct. An eigenvalue may be computed as the sum of the squared factor loadings for all the variables. Eigenvalues are of central importance in linear algebra (i.e., matrix algebra).

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Psychology term of the day

February 10th 2025

Müllerian mimicry

a form of mimicry in which two or more species, each of which is toxic or potentially harmful, have similar body shape or coloration. For predators, a single experience with a member of one of these species can lead to learned avoidance of all similar-looking animals, conferring protection on all the mimetic species. [Johann Friedrich Theodor Müller (1822–1897), German zoologist]