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Estimation of the covariance matrix of random effects in longitudinal studies
2007
Annals of Statistics
Longitudinal studies are often conducted to explore the cohort and age effects in many scientific areas. The within cluster correlation structure plays a very important role in longitudinal data analysis. This is because not only can an estimator be improved by incorporating the within cluster correlation structure into the estimation procedure, but also the within cluster correlation structure can sometimes provide valuable insights in practical problems. For example, it can reveal the
doi:10.1214/009053607000000523
fatcat:x6u3qclakrgr3bkryyxq4ooaaa