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UNIVERSITY OF SOUTH CAROLINA

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We are one of the best and fastest growing academic units at USC. Our impressive and diverse research portfolio and our strong tradition of collaborating with public and private health agencies and institutions enable us to

  • generate new knowledge that can lead to improvements in health
  • train highly educated health professionals
  • serve the larger communities in which we live and work, by using our special skills and knowledge.

News & Notes


ASPPH Welcomes Class of 2014 ASPPH/CDC Allan Rosenfield Global Health Fellows

Ms. Manza Agovi, graduate of University of South Carolina Arnold School of Public Health, will be based in Namibia while working on a one year assignment at Centers for Disease Control and Prevention (CDC), within the Center for Global Health (CGH). | Read More


Bias analysis for misclassification in a multicategorical exposure in a logistic regression model

September 17, 4:00-5:00 2014
Discovery I Room 140
By Juxin Liu, Associate Professor
Department of Mathematics and Statistics
University of Saskatchewan

Abstract: We extend the analysis of asymptotic bias in Davidov et. al. (2003) from a binary misclassified exposure to a multicategory misclassified exposure. Further, for a logistic regression model with a misclassified exposure only, we provide a general conclusion on the direction of the biases under nondifferential misclassification assumption. For a better understanding of how the bias is influenced by the misclassification model, we use a numerical example. It shows that the magnitude of bias increases as the amount of misclassification error increases in the context of nondifferential misclassification. While in the context of differential misclassification, the change of bias is more complex without a clear trend.

 

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