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What is an autocorrelation?

What is an autocorrelation? Here are some definitions.

Noun
  1. (statistics, signal processing) The cross-correlation of a signal with itself: the correlation between values of a signal in successive time periods.
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Examples
Such a series of treatment successes would conform to a white noise pattern, with no significant autocorrelation in a time series analysis.
The time series nature of the data set suggests that autocorrelation could be a problem.
Hence, we present the values along with our primary results, which are corrected for spatial autocorrelation.
Results from both autocorrelation and cross-correlation measurements were analyzed using the same equation.
In contrast, the off-diagonal elements, representing autocorrelation across equations, are generally negative, although small in value.
Because the data analyzed in Table 2 represent a pooled cross-sectional time series we tested for the presence of autocorrelation.

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