autocorrelation

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autocorrelation

[¦ȯd·ō‚kär·ə′lā·shən]
(electronics)
A technique used to detect cyclic activity in a complex signal.
(statistics)
In a time series, the relationship between values of a variable taken at certain times in the series and values of a variable taken at other, usually earlier times.
References in periodicals archive ?
Moreover, estimating the auto-correlation coefficients prior to the removal of the trend may lead to overestimating such coefficients.
The simulation results clearly exhibit that the proposed algorithms outperforms the classical spectrum sensing techniques (energy detection and auto-correlation based detection) under all SNR and buffer sizes, giving much improved PFD, PLD and ROC.
In addition, the phase information in the Fourier transform of the individual pulse is not retained in the auto-correlation, therefore the power density spectrum of the pulse train does not have a unique solution (that is, the same power spectral density can be obtained from different collections of signals).
However, if the input process is not a stationary white noise and is further passed through a(n) exponential, rectangular, triangular and trapezoidal shaped window, then, it becomes difficult to compute auto-correlation and cross-correlation of the output process using transform techniques.
Improved auto-correlation during manual point measurement in the Stereo Point Measurement tool
Manual or automatic lens parameter settings - Auto-correlation or manual (user-assisted) placement - Perspective and cylindrical (pan-head) projection - Gradual, sharp, and combination blending - Blend-only mode for making collages - Low-resolution preview stitching for quick results before
3 whereas dL and dU are the lower and upper values of DW test respectively, then there is no auto-correlation in the model.
The regression statistics and auto-correlation values determined for the three models for each site are presented in Table 1.
case, saddlepoint expansions for directional test probabilities, on the density of minimum contrast estimators, on the use of a parameter dependent group structure for inference, diffusion-type models with given marginal distribution and auto-correlation functions.
We also used a standard auto-correlation test [6,12,16] to corroborate the results of the H.
60, with the sole exception of rental rate, whose cyclical component displays negative auto-correlation (-0.
In the medium-to-late phase of the last century, Australian scholar Moran proposed the Moran index and used it in the testing of spatial auto-correlation (Moran, 1948).