Sökning: "covariates"
Visar resultat 1 - 5 av 131 avhandlingar innehållade ordet covariates.
1. Observed score equating with covariates
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
2. Prediction Methods for High Dimensional Data with Censored Covariates
Sammanfattning : While access to data steadily increases, not all data are straight-forward to use for prediction. Censored data are common in several industrial scenarios, and typically arise when there are some limitations to measuring equipment such as for instance concentration measuring equipment in chemistry or signal receivers in signal processing. LÄS MER
3. Structural Models of Network Contacts Between Actors Governed by Activity and Attraction
Sammanfattning : This thesis consists of five papers on the subject of statistical modeling of stochastic networks. The NG-model proposed in Paper I combines a block structure with parameters that capture the identities of vertices and thus the new approach stresses the concept of ego-nets, which describes the structure around identified vertices. LÄS MER
4. Methodology for Handling Missing Data in Nonlinear Mixed Effects Modelling
Sammanfattning : To obtain a better understanding of the pharmacokinetic and/or pharmacodynamic characteristics of an investigated treatment, clinical data is often analysed with nonlinear mixed effects modelling. The developed models can be used to design future clinical trials or to guide individualised drug treatment. LÄS MER
5. Aggressive antisocial behavior- clinical, cognitive, and behavioral covariates of its persistence
Sammanfattning : Introduction Aggressive antisocial behavior is a major challenge to society, and studies on the determinants of its persistence are essential to the development of strategies to prevent violence. Aims & Methods The overall aim of the thesis was to establish covariates of persistent aggressive antisocial behavior in a population-based cohort and in clinically evaluated, prospectively followed, offender groups. LÄS MER