Results 11 to 20 of about 661 (172)
Estimation of variance and covariance components--MINQUE theory
Journal of Multivariate Analysis, 1971 The paper consists of two parts. The first part deals with solutions to some optimization problems. The general problem is one of minimising trace \(AVA' U\) with respect to elements of matrix \(A\), where \(V\) and \(U\) are positive definite matrices, subject restrictions of the type \(AX=0\) or \(X'AX=0\) and trace \(AV_i=p_i\), \(i=1,\dots,k\), or \
C. Rao
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Computation of variance components by the MINQUE method
Journal of Multivariate Analysis, 1986 We present a new method of computing C. R. Rao's MINQUE in variance component models \((y=X\beta +U_ 1\xi_ 1+\cdots +U_ p\xi_ p)\), which requires only inversion and storage of \(n_ i\times n_ i\) matrices, where \(n_ i\) is the number of columns in \(U_ i\). In many cases most of these matrices are of diagonal form.
J. Kleffe, B. Seifert
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The nonnegative MINQUE estimate
Journal of Multivariate Analysis, 1985 The purpose of this paper is to give a characterization of the nonnegative MINQUE estimate for variance components. A similar characterization has been given by \textit{F. Pukelsheim} [Math. Operationsforsch. Stat., Ser. Stat. 12, 271-286 (1981; Zbl 0488.62051)] but only in some special cases.
Massam, Helene, Muller, Jochen
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Comparison of the Stochastic Models for Double-Differenced GPS Measurements [PDF]
ITB Journal of Engineering Science, 2004 Double-differenced GPS carrier phase measurements are commonly used in GPS precise positioning applications and processed with algorithms based on the least-squares (LS) principle. In order to apply the LS principle, one needs to define properly both the
Dudy Darmawan, Fumiaki Kimata
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Genetics in psychiatry: Methods, clinical applications and future perspectives. [PDF]
PCN Rep, 2022 Abstract Psychiatric disorders and related traits have a demonstrated genetic component, with heritability estimated by twin studies generally between 80% and 40%. Their pathogenesis is complex and multi‐determined: environmental factors interact with a polygenic architecture, making difficult the development of models able to stratify patients or ...
Fabbri C.
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Eine Bemerkung zur Anwendung der MINQUE-Methode
, 1977 In dem von Hildreth und Houck (1968) vorgestellten linearen Regressionsmodell mit stochastisehen Koeffizienten lautet die t-te Gleichung $${{\text{y}}_{\text{t}}} = \mathop \sum \limits_{{\text{k = 1}}}^{\text{K}} {\text{ }}{\beta _{{\text{tk}}}}{{\text{x}}_{{\text{tk}}}} = \mathop \sum \limits_{{\text{k = 1}}}^{\text{K}} {\text{ }}\left( {{\beta _{
Claus Hild
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Estimating Chronological Age From the Electrical Activity of the Brain: How EEG-Age Can Be Used as a Marker of General Brain Functioning. [PDF]
PsychophysiologyImpact Statement Our goal was to use the EEG power‐frequency spectrum to estimate ‘brain age’. Using multivariate methods to analyze the broad EEG spectrum (0.1–45 Hz), EEG‐age and chronological age were correlated strongly, and EEG‐age was a more accurate estimate and accounted for more variance in chronological age than well‐established Peak Alpha ...
James TM, Burgess AP.
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Journal of Animal Breeding and Genetics, Volume 140, Issue 6, Page 624-637, November 2023., 2023 Abstract Non‐additive genetic effects are well known to play an important role in the phenotypic expression of complex traits, such as fertility and reproduction. In this study, a genome scan was performed using 41,640 single nucleotide polymorphism (SNP) markers to identify genomic regions associated with epistatic (additive‐by‐additive) effects in ...
Kristen Alves +3 more
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Assessing the utility of a novel entrustment‐supervision assessment tool
Medical Education, Volume 57, Issue 10, Page 949-957, October 2023., 2023 Abstract Background Work‐based assessments (WBAs) are increasingly used to inform decisions about trainee progression. Unfortunately, WBAs often fail to discriminate between trainees of differing abilities and have poor reliability. Entrustment‐supervision scales may improve WBA performance, but there is a paucity of literature directly comparing them ...
Sebastian Dewhirst +3 more
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, 1992 This paper gives a detailed description of the implementation of ML-estimation using scoring and EM for the hyperparameters of a particular econometric state space.
W. Schneider
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