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Abstract colorful patterns with fluid shapes and vibrant swirls, showcasing random effects in digital art.

Random Sound Effects Soundboard

Biostatisticians use "fixed" and "random" effects to respectively refer to the population-average and subject-specific effects. A random effects model is a special case of a mixed model, which assumes that the data being analysed are drawn from a hierarchy of different populations.
See also: Analysis of variance, Fixed effects model, Mixed model, Multilevel model, Meta-analysis, and Best linear unbiased prediction.
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