Biostatistics Seminar - "On the Correction for Misclassification Bias in Drug Safety Data Using Validation Sample Approaches"
Chris Gravel, PhD
Post-Doctoral Fellow, Department of Epidemiology, Biostatistics and Occupational Health, 看片视频 University
On the Correction for Misclassification Bias in Drug Safety Data Using Validation Sample Approaches
ALL ARE WELCOME
Abstract:
Outcome misclassification in patient health records can bias estimation of adverse drug reaction risk.聽 In this discussion, we will first consider a binary setting and demonstrate the use of internal validation sampling to offset misclassification bias in estimation of the odds-ratio.聽 Investigation of the relative efficiency of odds-ratio estimators arising from the use of conditional versus random validation sampling will be investigated in simulation studies, focusing on differences in the selection of the categorical composition underlying the validation data.聽 A Monte Carlo approximation to validation sample size determination will be recommended.聽 To address the additional influence of confounding, we will introduce an inverse probability weighted approach to rebalance covariates across treatment groups while continuing to mitigate the impact of misclassification bias.
Next, for right censored continuous time survival data, failing to observe the event of interest can introduce misclassification bias in risk estimation. Incorrectly observing cause-specific event types at correctly recorded event times can also introduce bias. An internal validation sampling approach is used to update a set of parametric likelihoods to produce unbiased estimates in scenarios with the presence of either or both of these errors. These approaches are validated through large simulation studies.聽
Bio:
Christopher Gravel is a Post-Doctoral Fellow at 看片视频 University in the Department of Epidemiology, Biostatistics and Occupational Health.聽 He completed his Ph.D. in Probability and Statistics at Carleton University in 2015.聽 His research interests focus on outcome misclassification in health-related data as well as signal detection methods applied to spontaneous reporting data (passive pharmacovigilance).