Sökning: "Statistik censoring"

Visar resultat 11 - 13 av 13 avhandlingar innehållade orden Statistik censoring.

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

    Författare :Marie-Louise Öhman; Hans Nyquist; Umeå universitet; []
    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; Statistics; computer and systems science; 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

  3. 12. Essays on Firm Turnover, Growth, and Investment Behavior in Ethiopian Manufacturing

    Författare :Mulu G Gebreeyesus; Göteborgs universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; firm turnover; productivity; firm growth; investment; adjustment cost; irreversibility; manufacturing; Africa; Ethiopia.;

    Sammanfattning : This thesis analyses the dynamics and investment behavior of Ethiopian manufacturing firms in post-reform period using establishment level industrial census panel data from 1996 to 2003. Three related topics such as firm turnover and productivity differentials, determinants of firm growth, and the effect of adjustment cost and irreversibility on firm investment decisions are investigated empirically. LÄS MER

  4. 13. Position Estimation and Tracking in Colloidal Particle Microscopy

    Författare :Mats Kvarnström; Göteborgs universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; censored regression; colloidal chemistry; depth estimation; diffusion coefficient; nonparametric function estimation; position estimation; rotational symmetry; tracking; template matching; video microscopy; rotational symmetry;

    Sammanfattning : This thesis presents methods for estimating the locations (including depth) of spherical colloidal particles in images recorded in video microscopy. Understanding the behavior of colloidal interactions and diffusion is of crucial importance in a vast number of areas. LÄS MER