Robustness of parameter and standard error estimates against ignoring a contextual effect of a subject-level covariate in cluster-randomized trials

Covariate measurement error and the esti

Covariate measurement error and the estimation of random effect parameters in a mixed model for longitudinal data

✍ Tor D. Tosteson; John P. Buonaccorsi; Eugene Demidenko 📂 Article 📅 1998 🏛 John Wiley and Sons 🌐 English ⚖ 163 KB 👁 3 views

We explore the effects of measurement error in a time-varying covariate for a mixed model applied to a longitudinal study of plasma levels and dietary intake of beta-carotene. We derive a simple expression for the bias of large sample estimates of the variance of random effects in a longitudinal mod