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<p>In <a href="page.php?w=statistics">statistics</a>, the autocorrelation of a real or complex <a href="page.php?w=random_process">random process</a> is the <a href="page.php?w=Pearson_correlation_coefficient">Pearson correlation</a> between values of the process at different times, as a function of the two times or of the time lag. Let  be a random process over time and  be the random variable at time . ( may be an <a href="page.php?w=integer">integer</a> for a <a href="page.php?w=discrete-time">discrete-time</a> process or a <a href="page.php?w=real_number">real number</a></p><p>
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