Online Google Dictionary

autocorrelation 中文解釋 wordnet sense Collocation Usage Collins Definition
Noun
/ˌôtōˌkôrəˈlāSHən/,
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autocorrelations, plural;
  1. Correlation between the elements of a series and others from the same series separated from them by a given interval

  2. A calculation of such correlation

  1. Autocorrelation is the cross-correlation of a signal with itself. Informally, it is the similarity between observations as a function of the time separation between them. ...
  2. The correlation between changes in a single variable over different time periods. If a price is negatively autocorrelated, a move down in one period would suggest a move up in the next, and vice versa. ...
  3. The same variable is observed over time. The observations produce different values which are correlated.
  4. Multiplication of a signal with a time-delayed replica of itself.
  5. The interdependence among the pairs of observations, usually in a time series, which are separated by a constant interval. Excessive autocorrelation can cause problems when estimating time-series models.
  6. The similarity or correlation between a sequence of data and itself, at different offsets. Clearly, at zero offset, any data sequence is maximally correlated to itself. ...
  7. statistical concept expressing the degree to which the value of an attribute at spatially adjacent points varies with distance or time separating the observations
  8. Technique for detecting weak signals against a strong background level. Signal is subjected to controlled delay, the original delay signals then being fed to the autocorrelation unit which responds strongly only if delay is an exact multiple of signal period.
  9. The correlation or similarity of values, generally values that are nearby in a dataset.  Temporal data are said to exhibit serial autocorrelation when values measured close together in time are more similar than values measured far apart in time. ...
  10. When the error terms produced by the regression model show a pronounced trend.
  11. a measure of how much a waveform resembles itself. The Fourier transform of the power spectrum.
  12. a method of computing a spatial covariance model for a regionalized variable. It measures a change in variance (variogram) or correlation (correlogram) with distance and/or azimuth.