单词	autocorrelation function
释义	autocorrelation function noun : a function that describes the autocorrelation of a quantity being continuously measured and that indicates the periodicity of the quantity Financial prices tend to be well approximated by the 'random walk'. The random walk never forgets. Every change is permanent. Changes are not reversed. The autocorrelation function of percentage changes (i.e. returns) shows near-zero values for autocorrelations. Ajay Shah, The Financial Express, 8 Feb. 2010 Word History First Known Use 1933, in the meaning defined above
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