This paper discusses design issues in'ecological studies'-epidemiological studies in which the relationship between disease and behavioural and environmental determinants is studied at the population rather than the individual level.
The number of study populations has little relevance beyond a certain point, the power and precision being limited by the total number of disease events and by the size of the sample surveys used to estimate the distributions of determinants within populations.
In most circumstances, optimal design requires the size of the sample surveys in each population to be related to the number of disease events which will occur in it, and for sampling to be stratified by age and/or sex.
Mots-clés Pascal : Epidémiologie, Surveillance population, Exposition, Sondage statistique, Stratification, Estimation statistique, Mesure, Plan optimal, Etude écologique
Mots-clés Pascal anglais : Epidemiology, Population survey, Exposure, Sample survey, Stratification, Statistical estimation, Measurement, Optimal design, Ecological study
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 96-0121352
Code Inist : 002B30A01A1. Création : 199608.