Sökning: "censoring"

Visar resultat 6 - 10 av 35 avhandlingar innehållade ordet censoring.

1. 6. EM Estimation in Phase Type Models

   Författare :Marita Olsson; Göteborgs universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; phase type distributions; coxian distribution; EM algorithm; I-divergence; density estimation; right censoring; interval censoring; standard error estimation; asymptotic theory; jackknife; relapse clinical trials; survival data; hidden Markov chain; I-divergence;

   Sammanfattning : This thesis consists of four articles whose theme in common is the class of phase type distributions. In the first article an EM algorithm is presented to estimate the parameters of a phase type distribution of fixed order. Also, it is shown that the algorithm can be used to approximate other continuous distributions by phase type distributions. LÄS MER

3. 7. Estimation of Wood Fibre Length Distributions with Data from Increment Cores

   Författare :Ingrid Svensson; Lennart Bondesson; Sara Sjöstedt deLuna; Aila Särkkä; Umeå universitet; []
   Nyckelord :Censoring; EM algorithm; fibre length distribution; increment core; MCEM algorithm; mixture distribution;

   Sammanfattning : .... LÄS MER

4. 8. Regression Analysis of Censored Data with Applications in Perimetry

   Författare :Anna Lindgren; Matematisk statistik; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; censored covariate; L_1 minimization; right-censoring; Quantile regression;

   Sammanfattning : This thesis treats regression analysis when either the dependent or the independent variable is censored. We deal with quantile regression when the dependent variable is censored. LÄS MER

5. 9. Methods for interval-censored data and testing for stochastic dominance

   Författare :Angel G. Angelov; Magnus Ekström; Maria Karlsson; Bengt Kriström; Per Johansson; Umeå universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Interval-censored data; Informative censoring; Self-selected intervals; Questionnaire-based studies; Maximum likelihood; Permutation test; Two-sample test; Stochastic dominance; Four-decision test; Statistics; statistik;

   Sammanfattning : This thesis includes four papers: the first three of them are concerned with methods for interval-censored data, while the forth paper is devoted to testing for stochastic dominance.In many studies, the variable of interest is observed to lie within an interval instead of being observed exactly, i.e. LÄS MER

7. 10. Machine learning methods for precision medicine

   Författare :Pablo Gonzalez Ginestet; Karolinska Institutet; Karolinska Institutet; []
   Nyckelord :;

   Sammanfattning : In precision medicine, predicting the risk of an event during a specific period may help, for example, to identify patients that need early preventive treatment. Modern machine learning (ML) techniques are therefore ideal for building these predictions. LÄS MER