Results 11 to 20 of about 82,329 (299)

Rao and Wald Tests for Nonhomogeneous Scenarios [PDF]

Sensors, 2012
In this paper, we focus on the design of adaptive receivers for nonhomogeneous scenarios. More precisely, at the design stage we assume a mismatch between the covariance matrix of the noise in the cell under test and that of secondary data.
Chengpeng Hao, Danilo Orlando, Chaohuan Hou   +2 more
exaly   +8 more sources

Generalised Score and Wald Tests [PDF]

Advances in Decision Sciences, 2010
The generalised score and Wald tests are described and related to their nongeneralised versions. Two interesting applications are discussed. In the first a new test for the Behrens-Fisher problem is derived. The second is testing homogeneity of variances from multiple univariate normal populations.
Paul Rippon, John C. W. Rayner
openaire   +3 more sources

Efficient Wald Tests for Fractional Unit Roots [PDF]

Econometrica, 2007
In this article we introduce efficient Wald tests for testing the null hypothesis of unit root against the alternative of fractional unit root. In a local alternative framework, the proposed tests are locally asymptotically equivalent to the optimal Robinson (1991, 1994a) Lagrange Multiplier tests.
Velasco Gómez, Carlos, Lobato, Ignacio N.   +1 more
core   +8 more sources

Rao and Wald Tests for Adaptive Detection in Partially Homogeneous Environment with a Diversely Polarized Antenna [PDF]

The Scientific World Journal, 2013
This study considers Rao test and Wald test for adaptive detection based on a diversely polarized antenna (DPA) in partially homogeneous environment. The theoretical expressions for the probability of false alarm and detection are derived, and constant ...
Chaozhu Zhang, Jing Zhang, Chengyuan Liu
doaj   +2 more sources

Rao and Wald Tests for Moving Target Detection in Forward Scatter Radar

Remote Sensing
This paper deals with adaptive moving target detection for a forward scatter radar in complex Gaussian noise. The echoes received by the forward scatter radar include not only the noise and the possible target signals but also the direct signals.
Zeyu Wang, Hongmeng Chen, Yachao Li, Dewu Wang   +3 more
doaj   +2 more sources

Rao and Wald Tests in Nonzero-Mean Non–Gaussian Sea Clutter

Remote Sensing
The non-Gaussian nature of radar-observed clutter echoes induces performance degradation in the context of remote sensing target detection when using conventional Gaussian detectors. To enhance target detection performance, this study addresses the issue
Haoqi Wu, Hongzhi Guo, Zhihang Wang, Zishu He   +3 more
doaj   +2 more sources

Wald tests of singular hypotheses

Bernoulli, 2016
Motivated by the problem of testing tetrad constraints in factor analysis, we study the large-sample distribution of Wald statistics at parameter points at which the gradient of the tested constraint vanishes. When based on an asymptotically normal estimator, the Wald statistic converges to a rational function of a normal random vector.
Mathias Drton
exaly   +5 more sources

Generalized inverses and asymptotic properties of Wald tests [PDF]

Economics Letters, 1987
We consider Wald tests based on consistent estimators of g-inverses of the asymptotic covariance matrix ∑ of a statistic that is n^1/2-asymptotically normal distributed under the null hypothesis. Under the null hypothesis and under any sequence of local alternatives in the column space of ∑, these tests are asymptotically equivalent for any choice of g-
Vuong, Quang H.
openaire   +4 more sources

Genome-Wide Analysis of Gene-Gene and Gene-Environment Interactions Using Closed-Form Wald Tests. [PDF]

Genet Epidemiol, 2015
Despite the successful discovery of hundreds of variants for complex human traits using genome-wide association studies, the degree to which genes and environmental risk factors jointly affect disease risk is largely unknown.
Yu Z, Demetriou M, Gillen DL.
europepmc   +3 more sources

How to use χ2 test correctly——the Wald΄s test and the implementation of SAS software

Sichuan jingshen weisheng, 2021
The purpose of this article was to introduce the Wald΄s test and the SAS implementation. The specific contents involved the following nine aspects， namely the general Wald΄s test，the robust Wald΄s test，the constrained Wald΄s χ2 test，the generalized Wald ...
Hu Chunyan, Hu Liangping
doaj   +1 more source