Sökning: "squared error"

Visar resultat 1 - 5 av 53 avhandlingar innehållade orden squared error.

  1. 1. Perceptual and Squared Error Aspects in Speech and Audio Coding

    Detta är en avhandling från Stockholm : Signaler, sensorer och system

    Författare :Harald Pobloth; Bastiaan Kleijn; Gernot Kubin; [2004]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Signalbehandling; speech coding; audio coding; auditory models; perceptual distortion measures; squared error; Signalbehandling; TECHNOLOGY Information technology Signal processing; TEKNIKVETENSKAP Informationsteknik Signalbehandling;

    Sammanfattning : In the process of quantization, speech and audio signals are changed. This thesis contains four papers concerned with comparing and minimizing different measures to quantify the changes introduced. Before quantization the signal can be transformed to another domain. Transforms related to the discrete Fourier transform allow for e. LÄS MER

  2. 2. Observed score equating with covariates

    Detta är en avhandling från Umeå : Department of Statistics, Umeå university

    Författare :Kenny Bränberg; Marie Wiberg; Xavier de Luna; Dag Sörbom; [2010]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Equating; observed score equating; true scores; item response theory; linear equating function; equipercentile equating; kernel equating; covariates; linear regression; mean squared error; SOCIAL SCIENCES Statistics; computer and systems science Statistics; SAMHÄLLSVETENSKAP Statistik; data- och systemvetenskap Statistik; Statistics; statistik;

    Sammanfattning : In test score equating the focus is on the problem of finding the relationship between the scales of different test forms. This can be done only if data are collected in such a way that the effect of differences in ability between groups taking different test forms can be separated from the effect of differences in test form difficulty. LÄS MER

  3. 3. Asymptotic Analysis of Hedging Errors Induced by Discrete Time Hedging

    Detta är en avhandling från Centre for Mathematical Sciences, Lund University

    Författare :Mats Brodén; [2010]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Discrete time hedging; discretization error; L2 convergence; Non-linear Kalman filters; Calibration;

    Sammanfattning : The first part of this thesis deals with approximations of stochastic integrals and discrete time hedging of derivative contracts; two closely related subjects. Paper A considers the problem of approximating the value of a Wiener process. LÄS MER

  4. 4. Maximum a posteriori deconvulution of ultrasonic data with applications in nondestructive testing : Multiple transducer and robustness is

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Tomas Olofsson; Uppsala universitet.; [2000]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Materials science; Ultrasonic pulse-echo testing; nondestructive testing; maximum a posteriori estimation; linear minimum mean squared error estimation; robust filtering; multivariable filtering; sparse deconvolution; Materialvetenskap; TECHNOLOGY Materials science; TEKNIKVETENSKAP Teknisk materialvetenskap; Signal Processing; signalbehandling;

    Sammanfattning : In the thesis, various aspects of deconvolution of ultrasonic pulse-echo signals in nondestructive testing are treated. The deconvolution problem is formulated as estimation of a reflection sequence which is the impulse characteristic of the inspected object and the estimation is performed using either maximum a posteriori (MAP) or linear minimum mean square error (MMSE) estimators. LÄS MER

  5. 5. Aspects of analysis of small-sample right censored data using generalized Wilcoxon rank tests

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Marie-Louise Öhman; Hans Nyquist; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Censored generalized Wilcoxon rank test statistics; Variance estimation; Jackknifing; Influence function; Gross error sensitivity; Break-Down point; Sensitivity curve; Location parameter estimation; Product-Limit estimator and Monte-Carlo Simulation; SOCIAL SCIENCES Statistics; computer and systems science; SAMHÄLLSVETENSKAP Statistik; data- och systemvetenskap; Statistics; statistik;

    Sammanfattning : The estimated bias and variance of commonly applied and jackknife variance estimators and observed significance level and power of standardised generalized Wilcoxon linear rank sum test statistics and tests, respectively, of Gehan and Prentice are compared in a Monte Carlo simulation study. The variance estimators are the permutational-, the conditional permutational- and the jackknife variance estimators of the test statistic of Gehan, and the asymptotic- and the jackknife variance estimators of the test statistic of Prentice. LÄS MER