Optimal selection of individuals for repeated covariate measurements in follow-up studies
Reinikainen, J., Karvanen, J., & Tolonen, H. (2016). Optimal selection of individuals for repeated covariate measurements in follow-up studies. Statistical Methods in Medical Research, 25(6), 2420-2433. https://doi.org/10.1177/0962280214523952
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Statistical Methods in Medical ResearchDate
2016Copyright
© The Author(s) 2014. This is a final draft version of an article whose final and definitive form has been published by SAGE Publications. Published in this repository with the kind permission of the publisher.
Repeated covariate measurements bring important information on the time-varying risk factors in long epidemiological follow-up studies. However, due to budget limitations, it may be possible to carry out the repeated measurements only for a subset of the cohort. We study cost-efficient alternatives for the simple random sampling in the selection of the individuals to be remeasured. The proposed selection criteria are based on forms of the D-optimality. The selection methods are compared with the simulation studies and illustrated with the data from the East–West study carried out in Finland from 1959 to 1999. The results indicate that cost savings can be achieved if the selection is focused on the individuals with high expected risk of the event and, on the other hand, on those with extreme covariate values in the previous measurements.
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