Seminar Notice
Statistical Laboratory
Iowa State University
DATE AND TIME: Monday, February 6 2006, 4:10 p.m.
PLACE: 319 Snedecor
SPEAKER: Sunni A. Barnes, Ph.D., Mayo Clinic, Rochester, MN
TITLE: Missing Data in Smoking Cessation Trials*
ABSTRACT
Standard practice assumes a participant in a smoking cessation trial who
does not report a smoking status at follow-up is smoking. Using data from an Air
Force study of smoking cessation programs in basic training which has virtually
no missing data, a simulation study is conducted to study the impact of
assumptions about missing data probability models and analysis procedures.
Missing data indicators are generated using MCAR, MAR, and NMAR assumptions.
Results using the standard assumption, complete-case analysis or multiple
imputation modeling are compared. The value of carefully considering predictors
of outcomes is clearly demonstrated.
*This work was done jointly with Michael D. Larsen, Paul A. Decker,
Darrell R. Schroeder, Robert C. Klesges, Mark W. Vander Weg
COFFEE: 3:45 p.m., 104 Snedecor Hall
Jeanette La Grange
Department of Statistics
102 Snedecor
Iowa State University
Ames, IA 50010-1210
515 294-3440 (office)
515 294-4040 (fax)