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Variation is a characteristic of language: there is more than one way of saying the same thing in a given language. Variation can exist in domains such as pronunciation (e.g., more than one way of pronouncing the same phoneme or the same word), lexicon (e.g., multiple words with the same meaning), grammar (e.g., different syntactic constructions expressing the same grammatical function), and ...
In music, variation is a formal technique where material is repeated in an altered form. The changes may involve melody, rhythm, harmony, counterpoint, timbre, orchestration or any combination of these.
Variation (music), a formal technique where material is altered during repetition Variations, a series of works by American avant-garde composer John Cage; Variations, 1982 Australian musical by Nick Enright and Terence Clarke
If is a vector-valued random variable, with values in , and thought of as a column vector, then a natural generalization of variance is [() ()], where = and is the transpose of , and so is a row vector.
Heart rate variability visualized with R-R interval changes Electrocardiogram (ECG) recording of a canine heart that illustrates beat-to-beat variability in R–R interval (top) and heart rate (bottom).
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