Search for dissertations about: "nonlinear regression"

Showing result 1 - 5 of 30 swedish dissertations containing the words nonlinear regression.

  1. 1. Identifying Influential Observations in Nonlinear Regression a focus on parameter estimates and the score test

    University dissertation from Stockholm : Department of Statistics, Stockholm University

    Author : Karin Stål; Stockholms universitet.; [2015]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Added parameter plot; differentiation approach; influential observation; nonlinear regression; score test; statistik; Statistics;

    Abstract : This thesis contributes to influence analysis in nonlinear regression and in particular the detection of influential observations. The focus is on a regression model with a known mean function, which is nonlinear in its parameters and where the function is chosen according to the knowledge about the process generating the data. READ MORE

  2. 2. Nonlinear Quantile Regression for Longitudinal Data

    University dissertation from Stockholm : Department of Statistics, Stockholm University

    Author : Andreas Karlsson; Uppsala universitet.; [2005]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; bootstrap; dependent errors; median regression; Monte Carlo simulation; panel data; repeated measures; SOCIAL SCIENCES Statistics; computer and systems science Statistics; SAMHÄLLSVETENSKAP Statistik; data- och systemvetenskap Statistik; SOCIAL SCIENCES Statistics; computer and systems science Statistics Biostatistics; SAMHÄLLSVETENSKAP Statistik; data- och systemvetenskap Statistik Biostatistik;

    Abstract : The overall objective of the two papers in this thesis is to examine the properties of the weighted nonlinear quantile regression estimator for the analysis of longitudinal data. To this end, the question of which weights to be used, the bias of the estimator and the possibility to calculate confidence intervals has to be examined. READ MORE

  3. 3. Weighted Regression with Application to Array Antennas

    University dissertation from Chalmers University of Technology

    Author : Astrid Lundgren; Chalmers tekniska högskola.; Chalmers University of Technology.; [2007]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Elektroteknik; elektronik och fotonik; Electrical engineering; electronics and photonics; Elektronik; Electronics; weighted regression; modelling; calibration; array antenna; statistical estimation theory;

    Abstract : A nonlinear system can be modelled with a simple linear model if the model is only valid locally. This can be done by assigning weights to the estimation data, as a function of the distance to the modelled point. The weighting is here used to develop a direction-dependent calibration method for array antennas. READ MORE

  4. 4. Contributions to Influence Diagnostics in Nonlinear Regression Analysis

    University dissertation from Department of Statistics, Stockholm University

    Author : Karin Stål; Stockholms universitet.; [2013]
    Keywords : SAMHÄLLSVETENSKAP; SOCIAL SCIENCES;

    Abstract : .... READ MORE

  5. 5. Estimation and Inference for Quantile Regression of Longitudinal Data With Applications in Biostatistics

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Andreas Karlsson; Uppsala universitet.; [2006]
    Keywords : Statistics; Bias correction; Bootstrap; Dependent errors; Hypothesis testing; Nonlinear model; Simulation study; Statistik;

    Abstract : This thesis consists of four papers dealing with estimation and inference for quantile regression of longitudinal data, with an emphasis on nonlinear models.The first paper extends the idea of quantile regression estimation from the case of cross-sectional data with independent errors to the case of linear or nonlinear longitudinal data with dependent errors, using a weighted estimator. READ MORE