#jsDisabledContent { display:none; } My Account | Register | Help

Search Results (1,494 titles)

Searched over 7.2 Billion pages in 0.73 seconds

 Federated Media Type

Autocorrelation (X)

 1|2|3|4|5 Records: 1 - 40 of 1,494 - Pages:
 Date: 2002, Volume: 107 Book Id: WPLBN0003156316 Subjects: autocorrelation, informatics ► Abstract
 Book Id: WHEBN0000002724 Subjects: Statistics, Regression analysis, Music Collections: World Heritage Encyclopedia ► Abstract Full Text Search Details...e function. Below: The sine function revealed in a correlogram produced by autocorrelation. ... ... Visual comparison of convolution, cross-correlation and autocorrelation. Autocorrelation, also... ... Autocorrelation, also known as serial correlation or cross-autocorrelation,[1] is the cross-correlation of a signal with itself at dif... ... Definitions Different fields of study define autocorrelation differently, and not all of these definitions are equivalen... ...ance. Statistics In statistics, the autocorrelation of a random process describes the correlation between value... ...s for mean μi and variance σi2 for all times i. Then the definition of the autocorrelation between times s and t is R(s,... ... then the mean μ and the variance σ2 are time-independent, and further the autocorrelation depends only on the lag between t and s: the correlation de... ...of values but not on their position in time. This further implies that the autocorrelation can be expressed as a function of the time-lag, and that th... ...nd time series analysis, to drop the normalization by σ2 and use the term "autocorrelation" interchangeably with "autocovariance". However, the normal...
 Book Id: WPLBN0079688438 Collections: Ted Nelson's Junk Mail Cartons ► Abstract
 Book Id: WHEBN0028624309 Subjects: Hermitian matrix, Toeplitz matrix Collections: World Heritage Encyclopedia ► Abstract Full Text Search Details...ital signal processing algorithms. It consists of elements of the discrete autocorrelation function, R_{xx}(j) arranged in the following manner: ... ...rix and a Toeplitz matrix. If \mathbf{x} is wide-sense stationary then its autocorrelation matrix will be nonnegative definite. Th... ... definite. The autocovariance matrix is related to the autocorrelation matrix as follows: \mathbf{C}... ... Signal processing The autocorrelation matrix is used in various digital signal processing algorit... ...ital signal processing algorithms. It consists of elements of the discrete autocorrelation function, R_{xx}(j) arranged in the following manner: ... ...rix and a Toeplitz matrix. If \mathbf{x} is wide-sense stationary then its autocorrelation matrix will be nonnegative definite. Th... ... definite. The autocovariance matrix is related to the autocorrelation matrix as follows: \mathbf{C}...
 Book Id: WPLBN0002196668 ► Abstract Full Text Search Details...abilities ............................................ Calculation of the autocorrelation function of a combination sequence ........................... .............................................. Simplified calculation of the autocorrelation function of a combination sequence ........................... ... ........................................................................ Autocorrelation function of a combination which has no extra peaks ........... ...ion of error function for double-loop best clock frequency Calculation of autocorrelation function for ranging sequences System for acquiring a thre... ......... Binary coded phasecoherent system for transmission of 2 bits/word Autocorrelation function of shift register code Shift register and generat... ............................................... C . Sequences with Two-Level Autocorrelation .............................................................. ...een them. Two vectors x, y are said to be orthogonal if C(x, y) = 0. The autocorrelation function C,(j) of a w-dimensional vector x is given by W ... ...01 110100100011 10 1001000111 110010001110 C. Sequences with Two-Level Autocorrelation If the correlation function of a w-dimensional vector x is... ...-67 then x (considered as a sequence) is said to have a flat or two-level autocorrelation function, or, briefly, to be a two-level sequence. If, mor...
 Book Id: WHEBN0001291698 Collections: World Heritage Encyclopedia ► Abstract Full Text Search Details...arious autocorrelation functions can be experimentally realized. The field autocorrelation may be used to calculate the spectrum of a source of light,... ...e used to calculate the spectrum of a source of light, while the intensity autocorrelation and the interferometric autocorrelation are commonly used t... ...an be made as short as a few femtoseconds. In the following examples, the autocorrelation signal is generated by the nonlinear process of second-harm... ...(SHG). Other techniques based on two-photon absorption may also be used in autocorrelation measurements, Roth, J. M., Murphy, T. E. & Xu, C. Ultrasens... ...f the signal will be slightly modified, but the basic interpretation of an autocorrelation trace remains the same. A detailed discussion on interfero... ...relation trace remains the same. A detailed discussion on interferometric autocorrelation is given in several well-known textbooks.J. C. Diels and W.... ...rspektroskopie: Grundlagen und Techniken, 5th Ed. (Springer, 2007). Field autocorrelation For a complex electric field E(t), the field autocorrelati... ...The Wiener-Khinchin theorem states that the Fourier transform of the field autocorrelation is the spectrum of E(t), i.e., the square of the magnitude ... ... of the magnitude of the Fourier transform of E(t). As a result, the field autocorrelation is not sensitive to the spectral phase. The field autocorr...
 Book Id: WPLBN0002208044 Collections: Time Series, Space and Aviation eDocuments Collection ► Abstract
 Book Id: WHEBN0016862495 Collections: World Heritage Encyclopedia ► Abstract Full Text Search Details...In time series analysis, the partial autocorrelation function (PACF) gives the partial correlation of a time ser... ...r the values of the time series at all shorter lags. It contrasts with the autocorrelation function, which does not control for other lags. ... ... Description Given a time series z_t, the partial autocorrelation of lag k, denoted \alpha(k), is the autocorrelation between... ...dence of z_t on z_{t+1} through z_{t+k-1} removed; equivalently, it is the autocorrelation between z_t and z_{t+k} that is not accounted for by lags 1... ...+k-1}. There are algorithms for estimating the partial autocorrelation based on the sample autocorrelations (Box, Jenkins, and Rei... ... algorithms derive from the exact theoretical relation between the partial autocorrelation function and the autocorrelation function. ... ...ion function and the autocorrelation function. Partial autocorrelation plots (Box and Jenkins, Chapter 3.2, 2008) are a commonly u... ...sed tool for identifying the order of an autoregressive model. The partial autocorrelation of an AR(p) process is zero at lag p + 1 and grea... ...an AR(p) process is zero at lag p + 1 and greater. If the sample autocorrelation plot indicates that an AR model may be appropriate, then th...
 Book Id: WPLBN0002196970 ► Abstract Full Text Search Details...etic scatter from rough surfaces. The other utilizes the theory and a new autocorrelation function of surface heights to fit the lunar radar data of... ...Kirchoff-Huyghens- Fresnel integral for scatter from a rough surface. The autocorrelation function of the ground height above the mean has been show... ...ure Size on Moon and&-th Radar Returnsat Various Anqles, I' uses a unique autocorrelation function to determine rough-surface scatter. This function... ... earth scatter observed by the Alouette sounder. The consequence of this autocorrelation 2 0 - 6- Conclu s ion The first six months have been ...
 Book Id: WHEBN0002399066 Collections: World Heritage Encyclopedia ► Abstract Full Text Search Details... series (seasonally differencing it if necessary), and using plots of the autocorrelation and partial autocorrelation functions of the dependent t... ...iance of residuals over time and performing a Ljung-Box test or plotting autocorrelation and partial autocorrelation of the residuals are helpful to... ...hould show constant location and scale . It can also be detected from an autocorrelation plot . Specifically, non-stationarity is often indicated by... ...correlation plot . Specifically, non-stationarity is often indicated by an autocorrelation plot with very slow decay. Detecting seasonality Seasona... ... seasonality Seasonality (or periodicity) can usually be assessed from an autocorrelation plot, a seasonal subseries plot, or a spectral plot . D... ...y be helpful to apply a seasonal difference to the data and regenerate the autocorrelation and partial autocorrelation plots. This may help in the mod... .... Akaike information criterion with correction. Other authors use the autocorrelation plot and the partial autocorrelation plot. Autocorrelatio... ...n plot and the partial autocorrelation plot. Autocorrelation and partial autocorrelation plots The sample autocorrelation plot and the sample parti... ...ocorrelation plots The sample autocorrelation plot and the sample partial autocorrelation plot are compared to the theoretical behavior of these plot...
 Book Id: WPLBN0002205778 ► Abstract
 Book Id: WHEBN0004507652 Collections: World Heritage Encyclopedia ► Abstract Full Text Search Details...code Autocorrelation function of a Barker-7 code ... ... a_j for j = 1, 2, \dots, N with the ideal autocorrelation property, such that the off-peak (non-cyclic) autocorrelati... ... and reversals of the codes have been omitted. A Barker code has a maximum autocorrelation sequence which has sidelobes no larger than 1. It is genera... ...e spread spectrum and pulse compression radar systems because of their low autocorrelation properties (The sidelobe level of amplitude of the Barker c... ...arker code resembles a discrete version of a continuous chirp, another low-autocorrelation signal used in other pulse compression radars. ... ...y long complementary sequences. For the case of cyclic autocorrelation, other sequences have the same property of having perfect (... ...ker sequence is used for the 1 and 2 Mbit/sec rates. The value of the autocorrelation function for the Barker sequence is 0 or −1 at all offsets ...
 Book Id: WPLBN0002207141 Collections: Language, Space and Aviation eDocuments Collection ► Abstract
 Book Id: WHEBN0001202314 Collections: World Heritage Encyclopedia ► Abstract Full Text Search Details...expectation operator. Autocovariance is related to the more commonly used autocorrelation by the variance of the variable in question. Stationarity... ...zed by dividing by the variance σ2, the autocovariance C becomes the autocorrelation coefficient function c, :c_{XX}(\tau) = \frac{C_{XX}(\tau... ...{C_{XX}(\tau)}{\sigma^2}.\, However, often the autocovariance is called autocorrelation even if this normalization has not been performed. The aut... ... C_{YY}(\tau) = \sum_{k, l=-\infty}^\infty a_k a^*_l C_{XX}(\tau+k-l).\, * Autocorrelation* P. G. Hoel, Mathematical Statistics, Wiley, New York, 1984...
 Book Id: WPLBN0079883351 ► Abstract Description Details...Variations on Autocorrelation Matching and the Sift Localization Algorithm by De Kooter, Peter M; published by Monterey, Calif. : Naval Postgraduate School ; Springfield, Va. : Available from National Technical Information Service...
 Book Id: WHEBN0022852276 Subjects: Regression analysis, Statistics, Econometrics Collections: World Heritage Encyclopedia ► Abstract Full Text Search Details...er of later variants.[2][3][4][5] The estimator is used to try to overcome autocorrelation, or correlation, and heteroskedasticity in the error terms ... ...egressions applied to time series data. The problem in autocorrelation, often found in time series data, is that the error terms a... ...ast squares (OLS) regression when the variables have heteroskedasticity or autocorrelation. w_\ell=1 - \frac{\ell}{L+1} ... ...enneth D (1987). "A Simple, Positive Semi-definite, Heteroskedasticity and Autocorrelation Consistent Covariance Matrix". Econometrica 55 (3): 703–708... ... ^ Andrews, Donald W. K. (1991). "Heteroskedasticity and autocorrelation consistent covariance matrix estimation". Econometrica 59 (... ...er of later variants.[2][3][4][5] The estimator is used to try to overcome autocorrelation, or correlation, and heteroskedasticity in the error terms ... ...egressions applied to time series data. The problem in autocorrelation, often found in time series data, is that the error terms a... ...ast squares (OLS) regression when the variables have heteroskedasticity or autocorrelation. w_\ell=1 - \frac{\ell}{L+1} ... ...enneth D (1987). "A Simple, Positive Semi-definite, Heteroskedasticity and Autocorrelation Consistent Covariance Matrix". Econometrica 55 (3): 703–708...
 Book Id: WPLBN0004305612 Collections: Government Library Collection ► Abstract Description Details...observations of the partial pressure of carbon dioxide in surface ocean waters (pCO2) collected between 1970 and 2003 is used to estimate its spatial autocorrelation structure. The patterns of the lag distance where the autocorrelation exceeds 0.8 is similar to patterns in the spatial distribution of the first baroclinic Rossby radius of deformation indicating that ocean c...
 Book Id: WHEBN0000292200 Subjects: Pitch (music), Christina Aguilera, Mýa Collections: World Heritage Encyclopedia ► Abstract Full Text Search Details...es so is still a matter of debate, but the processing seems to be based on an autocorrelation involving the timing of neural impulses in the auditor... ...eural mechanisms which may accomplish a delay, a necessary operation of a true autocorrelation, have not been found. At least one model shows a tempor... ...und. At least one model shows a temporal delay to be unnecessary to produce an autocorrelation model of pitch perception, appealing to phase shifts ... ...ver, earlier work has shown that certain sounds with a prominent peak in their autocorrelation function do not elicit a corresponding pitch percept, ... ... corresponding pitch percept, and that certain sounds without a peak in their autocorrelation function nevertheless elicit a pitch. Autocorrelation c...
 Date: 1989, Volume: 1557 Book Id: WPLBN0003163317 Collections: American Libraries Collection ► Abstract
 Book Id: WHEBN0003350111 Collections: World Heritage Encyclopedia ► Abstract Full Text Search Details...n–Einstein theorem or the Khinchin–Kolmogorov theorem ) states that the autocorrelation function of a wide-sense-stationary random process has a...
 Date: 1992, Volume: 92-171 Book Id: WPLBN0003091757 Subjects: Economics ► Abstract
 Book Id: WHEBN0000213960 Subjects: Zangger Committee, Zettacoulomb, Zeptocoulomb Collections: World Heritage Encyclopedia ► Abstract Full Text Search Details...n complex-valued sequence with the CAZAC property (constant amplitude zero autocorrelation waveform) Honda D engine, an engin...
 Book Id: WPLBN0003963822 Subjects: Journals, Science, Medical Science ► Abstract Description Details...Description : Spatial autocorrelation plays an important role in geographical analysis: however, there is still room for improvement of this method. The formula for Moran’s index is complicated, and several basic problems remain to be solved. Ther...
 Book Id: WHEBN0008799355 Collections: World Heritage Encyclopedia ► Abstract Full Text Search Details...y sequences (CS) are pairs of sequences with the useful property that their out-of-phase aperiodic autocorrelation coefficients sum to zero. Binary co... ...be a pair of bipolar sequences, meaning that a(k) and b(k) have values +1 or −1. Let the aperiodic autocorrelation function of the sequence x be defin... ... where C is a constant. So we can say that the sum of autocorrelation functions of complementary sequence... ...sum of autocorrelation functions of complementary sequences is a delta function, which is an ideal autocorrelation for many applications like radar pu... ... As the simplest example we have sequences of length 2: (+1, +1) and (+1, −1). Their autocorrelation functions are (2, 1) and (2,&n... ...s of length 4), we have (+1, +1, +1, −1) and (+1, +1, −1, +1). Their autocorrelation functions are (4, 1, 0,&n... ..., −1, +1) and (+1, +1, +1, −1, −1, −1, +1, −1). Their autocorrelation functions are (8, −1, 0,&... ...) and (+1, +1, −1, +1, +1, +1, +1, +1, −1, −1). Their autocorrelation functions are (10, −3, 0,... ... sequences Complementary sequences have complementary spectra. As the autocorrelation function and the power spectra form...
 Date: 2012, Vol. XXXIX-B3, Issue 1 Book Id: WPLBN0004016543 Subjects: Science, Isprs, International Collections: Engineering, Copernicus Publications ► Abstract Description Details...na. To deal with the problem of spectral variability in high resolution satellite images, this paper focuses on the analysis and modelling of spatial autocorrelation feature. The semivariograms are used to model spatial variability of typical object classes while Getis statistic is used for the analysis of local spatial autocorrelation within the neighbourhood window deter...
 Book Id: WHEBN0018831489 Collections: World Heritage Encyclopedia ► Abstract Full Text Search Details...he complex plane . The answer to this would yield information about the autocorrelation of binary sequences. They are named for J. E. Littlewood ...
 Book Id: WPLBN0003969509 Subjects: Journals, Science, Medical Science ► Abstract Description Details...ence. We compared the performance of experienced dart players and beginners in a dart task. A hallmark of the optimal learning rate is that the lag-1 autocorrelation of movement endpoints is zero. We found that the lag-1 autocorrelation of experienced dart players was near zero, implying a near-optimal learning rate, whereas it was negative for beginners, suggesting a larg...
 Book Id: WHEBN0002257634 Collections: World Heritage Encyclopedia ► Abstract Full Text Search Details...xation, of phase space sampling and of unimolecular laws of decay via autocorrelation function s. Occurrence of quantum effects in competitive un...
 Book Id: WPLBN0002540206 Subjects: Ocean temperature, Time-series analysis ► Abstract
 Book Id: WHEBN0026207745 Collections: World Heritage Encyclopedia ► Abstract Full Text Search Details...ey test after Breusch and Leslie G. Godfrey, which can be used to identify autocorrelation in the errors of a regression model. Aw... ...911963.  Breusch, T. S. (1979). "Testing for Autocorrelation in Dynamic Linear Models". Australian Economic Papers 17: 3... ...ey test after Breusch and Leslie G. Godfrey, which can be used to identify autocorrelation in the errors of a regression model. Aw... ...911963.  Breusch, T. S. (1979). "Testing for Autocorrelation in Dynamic Linear Models". Australian Economic Papers 17: 3...
 Date: 2008, Vol. 8, Issue 1 Book Id: WPLBN0004023397 Subjects: Science, Ecology ► Abstract Description Details...ept. Community Ecology (BZF), Theodor-Lieser-Strasse 4, 06120 Halle, Germany. Species distributional data based on lattice data often display spatial autocorrelation. In such cases, the assumption of independently and identically distributed errors can be violated in standard regression models. Based on a recently published review on methods to account for spatial au...
 Book Id: WHEBN0000041205 Collections: World Heritage Encyclopedia ► Abstract Full Text Search Details... Frequency-resolved optical gating, a term related to autocorrelation in optics Gating signal, a signal ...
 Date: 2008, Vol. 15, Issue 4 Book Id: WPLBN0003980140 Subjects: Science, Nonlinear, Processes ► Abstract
 Book Id: WHEBN0000294866 Subjects: Astronomy, Physical cosmology, Probability Collections: World Heritage Encyclopedia ► Abstract Full Text Search Details... in the universe. By default, correlation function refers to the two-point autocorrelation function. For a given distance, the two-point autocorrelati... ...\int dk \, k^2 P(k) \, \frac{\sin(kr)}{kr} The n-point autocorrelation functions for n greater than 2 or cross-correlation functio... ...nctions for particular object types are defined similarly to the two-point autocorrelation function. The correlation function is i...
 Book Id: WPLBN0003937418 Subjects: Journals, Science, Medical Science ► Abstract Description Details...eveloped a hierarchical Bayes approach to model the relationships between bird species occupancy and local landcover variables accounting for spatial autocorrelation, species similarities, and partial observability. We fit alternative occupancy models to detections of 90 bird species observed during repeat visits to 316 point-counts forming a 400-m grid throughout the Patu...
 Book Id: WHEBN0004078411 Collections: World Heritage Encyclopedia ► Abstract Full Text Search Details...ng, cryptography and as random sequences. These sequences have fairly good autocorrelation properties. References ...
 Book Id: WPLBN0002540204 Subjects: Ocean temperature, Time-series analysis ► Abstract
 Book Id: WHEBN0001988182 Collections: World Heritage Encyclopedia ► Abstract Full Text Search Details...roduced complementary sequences. Those are pairs of binary sequences whose autocorrelation functions add up to zero for all non-zero time shifts. Toda... ...hyon Digital Coding, Proc. IRE, vol. 37, p. 657, (1949)Sieves for Low Autocorrelation Binary Sequences, IEEE Trans. Info. Theory, vol. IT-23, pp....
 Date: 2006, Vol. 3, Issue 4 Book Id: WPLBN0003987716 Subjects: Science, Hydrology, Earth ► Abstract Description Details...s and groundwater quality variables. Data uncertainty is categorised and assessed in terms of probability density functions and temporal or spatial autocorrelation functions. The autocorrelation length scales are crucial when support scale is changing and it is demonstrated how the assumption used when estimating the autocorrelation parameters may limit the applicabil...
 Book Id: WHEBN0002399098 Collections: World Heritage Encyclopedia ► Abstract Full Text Search Details...well-known versions of a portmanteau test are available for testing for autocorrelation in the residuals of a model: it tests whether any of a gro... ...relation in the residuals of a model: it tests whether any of a group of autocorrelation s of the residual time series are different from zero. T...
 1|2|3|4|5 Records: 1 - 40 of 1,494 - Pages: