An incidence density sampling program for nested case-control analyses

An incidence density sampling program for nested case-control analyses.

BACKGROUND The nested case-control design can be a very efficient approach to an epidemiological investigation. In order to obtain unbiased estimates of relative risk, controls should be selected by incidence density sampling, which involves matching each case to a sample of those who are at risk at the time of case occurrence. METHODS This paper presents a simple computer program for inciden...

Sampling strategies in nested case-control studies.

A stratified version of nested case-control sampling which we call "countermatching" is presented. This design uses data available for all cohort members to obtain a sample for collecting additional information in a case-control substudy. Hitherto the only stratified sampling design for such studies has involved matching of controls to cases with respect to confounding variables. However, in so...

development and implementation of an optimized control strategy for induction machine in an electric vehicle

in the area of automotive engineering there is a tendency to more electrification of power train. in this work control of an induction machine for the application of electric vehicle is investigated. through the changing operating point of the machine, adapting the rotor magnetization current seems to be useful to increase the machines efficiency. in the literature there are many approaches wh...

Case–Control Study, Nested

Analysis of Clinical Cohort Data Using Nested Case-control and Case-cohort Sampling Designs

K. Ohneberg1,2; M. Wolkewitz1,2; J. Beyersmann3; M. Palomar-Martinez4,5; P. Olaechea-Astigarraga6; F. Alvarez-Lerma7; M. Schumacher1 1Institute for Medical Biometry and Statistics, Medical Center University of Freiburg, Freiburg, Germany; 2Freiburg Center for Data Analysis and Modelling, University of Freiburg, Freiburg, Germany; 3Institute of Statistics, Ulm University, Ulm, Germany; 4Hospital...