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Day of Monday, July 8, 2013 < Previous | Next >
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Lecture/Seminar Auxiliary data can partially correct for bias due to non-random missingness in longitudinal studies 2013-07-08 11:00:00
Description

Speaker: Dr. Charles Hall, Albert Einstein College of Medicine

When missing data in longitudinal studies depend on unobserved values, this missing not at random (MNAR) situation can cause estimates of trajectories and of the effects of risk factors to be biased.   Joint modeling using auxiliary data can partially correct this bias. (Wang and Hall 2010 Statistics in Medicine.) We apply this method to the study of the effect of the APOE e4 genotype on memory decline in an elderly cohort from the Einstein Aging Study. The Free and Cued Selective Reminding Test (FCRST) is used to model memory decline, and the Memory Impairment Screen for Telephone (MIS-T) is used as auxiliary data as it was administered to study participants even when they could not be given the FCSRT. Joint modeling of the FCSRT and MIS-T shows that the estimate of the effect of APOE e4 genotype is significantly underestimated in naïve approaches that ignore the non-random missing data. Simulations show that it is likely that the correction for this missingness is only partial. More research is needed to identify optimal auxiliary data for specific situations, and to further improve the accuracy of statistical methodology used to address the bias.

Dr. Hall has contributed to a variety of innovative methods for longitudinal analysis of aging and health-related change (http://eph.aecom.yu.edu/hall). The methodological issues he will discuss related to treatment of incomplete data have applications to any study, cross-sectional or longitudinal. He is an excellent speaker – we hope you can make it.

Related Website
Location MEDICAL SCIENCES BUILDING
150
Times 11:00:00 to 12:30:00
Pricing

Free and open to public.

Sponsor Andrea Piccinin and Scott Hofer
250-853-3861 or 250-853-3862
piccinin@uvic.ca
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