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TonyC
Nuclear Energy Trader

Total Posts: 1280
Joined: May 2004
 
Posted: 2007-02-15 15:40
thought my ACM digital library membership would get me these, [qs they all show up on the acm's digital library's ''portal'' pages], but somehow theyre not on the digital library and i cant seem to find a non-j-store instance via google

so if any kind NP'ers could send along copies of these i'd ge greatful

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Change-point detection of mean vector or covariance matrix shifts using multivariate individual observations
Journal IIE Transactions
Publisher Springer Netherlands
ISSN 0740-817X (Print) 1573-9724 (Online)
Subject Biomedical and Life Sciences
Issue Volume 32, Number 6 / June, 2000
DOI 10.1023/A:1007676020397
Pages 537-549
SpringerLink Date Monday, November 01, 2004

Abstract A preliminary control chart is given for detecting a shift in the mean vector, the covariance matrix, or both, when multivariate individual observations are available. The data are partitioned after each observation in turn, and the likelihood ratio statistic for a shift is calculated. The control chart is obtained by plotting these statistics after dividing by the expected value under the condition of no shift. This adjustment is done in order to reduce the variation in sensitivity with the location of any shift. Using generalized inverses allows the detection of a shift after as few as two of the observations, or with as few as two remaining observations, or at any intermediate point. Multiple shifts often can be detected by recursive application of the method. When a shift is detected, the plotted statistic is divided into a part due to the shift in the sample mean vector and another part attributable to a shift in the sample covariance matrix. This is done for diagnostic purposes. Using simulation, approximate values are given for the expected values of the plotted statistics and an upper control limit.

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Statistics: A Journal of Theoretical and Applied Statistics
Publisher: Taylor & Francis
Issue: Volume 39, Number 3 / June 2005
Pages: 221 - 246
URL: Linking Options
DOI: 10.1080/02331880500062170

Surveillance of the covariance matrix of multivariate nonlinear time series

Przemysław śliwa A1 and Wolfgang Schmid A1

A1 Department of Statistics, Europe University, P.O. Box 1786, 15207, Frankfurt (Oder), Germany

Abstract:

In this paper, sequential procedures for the surveillance of the covariance matrices of multivariate nonlinear time series are introduced. Two different types of control charts are proposed. The first type is based on the exponential smoothing of each component of a local measure for the covariances. The control statistic is equal to the Mahalanobis distance of this quantity with its in-control mean. In our second approach, the Mahalanobis distance is first determined and after that it is exponentially smoothed. We discuss three examples of local measures.

Several properties of the proposed schemes are discussed assuming the target process to be generated by a multivariate GARCH(1, 1) model. The generalization to the family of spherical distributions allows the modelling of frequently observed fat tails in financial data. Some results of an extensive Monte Carlo simulation study are provided in order to judge the performance of the presented control schemes. As a performance measure we use the average run length. An empirical example illustrates the importance of the fast detection of the changes in the covariance structure of the returns of financial assets.


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A Note on Multivariate CUSUM Procedures
John D. Healy
Technometrics, Vol. 29, No. 4 (Nov., 1987), pp. 409-412
doi:10.2307/1269451

Abstract

Cumulative sum (CUSUM) procedures are among the most powerful tools for detecting a shift from a good quality distribution to a bad quality distribution. This article discusses the natural application of CUSUM procedures to the multivariate normal distribution. It discusses two cases, detecting a shift in the mean vector and detecting a shift in the covariance matrix. As an example, the procedure is applied to measurements taken on optical fibers.

flaneur/boulevardier/remittance man/energy trader

braincat


Total Posts: 343
Joined: Oct 2004
 
Posted: 2007-02-15 15:50
I could only find this one:Attached File: 0.pdf

FDAXHunter
Founding Member

Total Posts: 8362
Joined: Mar 2004
 
Posted: 2007-02-15 15:57
Same here. Only the "CUSUM Procedures" one.

The Figs Protocol.

doreilly


Total Posts: 100
Joined: Feb 2006
 
Posted: 2007-02-15 16:39
?

zMan


Total Posts: 42
Joined: Nov 2006
 
Posted: 2007-02-15 21:19
You guys are awesome!!

per aspera ad astra

nikol


Total Posts: 520
Joined: Jun 2005
 
Posted: 2018-09-26 11:09
Curious about CUSUM, thank you.

Mickey


Total Posts: 1
Joined: Sep 2018
 
Posted: 2018-09-29 14:57
The post is giving you nice views to learn. use 1$ domain hosting service.
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