Weighted Least Squares
Mostrando 25-36 de 48 artigos, teses e dissertações.
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25. Estimação dinamica de parametros da carga em sistemas de energia eletrica
This work is focused on the implementation and evaluation of computational algorithms related to methods and techniques for dynamic parameter estimation of one ofthe power system components: the load. This estimation allows to evaluate more precisely the supervised power system load through the use of different 10ad models. In this work the dynamic load para
Publicado em: 2001
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26. Estimação estatica de estado em sistemas de energia eletrica utilizando fatoração ortogonal QR
This work is concerned with computational aspects of the problem of static state estimation and bad data processing, in electrical power systems, using the nonlinear weighted least-squares technique. Modified Newton type methods, for solution of the nonlinear least-squares problem, are briefly presented and analysed. For solution of the sequence of linear le
Publicado em: 1994
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27. Use of features derives from class proportions in a pixel for the multispectral classification of remote sensing images / Utilização de atributos derivados de proporções de classes dentro de um elemento de resolução de imagem ("pixel")na classificação multiespectral de imagens de sensoriamento remoto
The spectral energy collected by the Remote Sensing instrumentation is the integration, called mixture, of the energy reflected or emmited by the objects, called primary components of the mixture, contained in a picture element. The land use classes in a scene can be described in terms of these components proportions, specially for forest targets. The object
Publicado em: 1991
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28. Strong consistency of least-squares estimates in regression models
A general theorem on the limiting behavior of certain weighted sums of i.i.d. random variables is obtained. This theorem is then applied to prove the strong consistency of least-squares estimates in linear and nonlinear regression models with i.i.d. errors under minimal assumptions on the design and weak moment conditions on the errors.
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29. Spreadsheet Method for Evaluation of Biochemical Reaction Rate Coefficients and Their Uncertainties by Weighted Nonlinear Least-Squares Analysis of the Integrated Monod Equation
A convenient method for evaluation of biochemical reaction rate coefficients and their uncertainties is described. The motivation for developing this method was the complexity of existing statistical methods for analysis of biochemical rate equations, as well as the shortcomings of linear approaches, such as Lineweaver-Burk plots. The nonlinear least-squares
American Society for Microbiology.
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30. Mathematical models for growth in alligator (Alligator mississippiensis) embryos developing at different incubation temperatures.
A variety of model-based (growth models) and model-free (cubic splines, exponentials) equations were fitted using weighted-nonlinear least squares regression to embryonic growth data from Alligator mississippiensis eggs incubated at 30 and 33 degrees C. Goodness of fit was estimated using a chi 2 on the sum of squared, weighted residuals, and run and sign te
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31. Estimation of the Coancestry Coefficient: Basis for a Short-Term Genetic Distance
A distance measure for populations diverging by drift only is based on the coancestry coefficient θ, and three estimators of the distance D = -ln(1 - θ) are constructed for multiallelic, multilocus data. Simulations of a monoecious population mating at random showed that a weighted ratio of single-locus estimators performed better than an unweighted averag
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32. Determination of three-dimensional low-resolution viral structure from solution x-ray scattering data.
The capsid is modeled as a region of constant electron density located between inner and outer envelopes that exhibit icosahedral symmetry. For computational purposes the envelopes are represented as truncated sums of weighted icosahedral harmonics. Methods are described for estimating the weights from x-ray solution scattering patterns based on nonlinear le
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33. Genetic Models for the Analysis of Data from the Families of Identical Twins
Genetic models are described which exploit the unique relationships that exist within the families of identical twins to obtain weighted least squares estimates of additive, dominance and epistatic components of genetic variance as well as estimates of the contributions of X-linked genes, maternal effects and three sources of environmental variation. Since a
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34. Clearance half life of mercury in urine after the cessation of long term occupational exposure: influence of a chelating agent (DMPS) on excretion of mercury in urine.
The elimination of mercury (Hg) in urine was investigated in 12 former chloro-alkali workers exposed to metallic Hg vapour for two to 18 (median five) years. Morning urine samples were taken on several (median 9) occasions after change of employment or retirement. The median follow up time was 28 months. The decrease in concentration of Hg in urine (U-Hg) wa
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35. Pharmacodynamics of Gemifloxacin against Streptococcus pneumoniae in an In Vitro Pharmacokinetic Model of Infection
The pharmacodynamics of gemifloxacin against Streptococcus pneumoniae were investigated in a dilutional pharmacodynamic model of infection. Dose fractionation was used to simulate concentrations of gemifloxacin in human serum associated with 640 mg every 48 h (one dose), 320 mg every 24 h (two doses), and 160 mg every 12 h (four doses). Five strains of S. pn
American Society for Microbiology.
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36. Quality of care and investment in property, plant, and equipment in hospitals.
OBJECTIVE. This study explores the relationship between quality of care and investment in property, plant, and equipment (PPE) in hospitals. DATA SOURCES. Hospitals' investment in PPE was derived from audited financial statements for the fiscal years 1984-1989. Peer Review Organization (PRO) Generic Quality Screen (GQS) reviews and confirmed failures between