November 24,2010

MODELING INCOMPLETE OBSERVATIONS WORKSHOP
November 24, 2010, 9:00am- 5:30pm
University Saint Joseph(USJ), School of Medicine, Beirut

Coordinated by:

- Dr. Michel Chavance, Research Director, "Institut National de la Sante et de la Recherche Medicale(INSERM U1018). Centre de Recherche en Epidemiologie et Sante des Populations", Villejuif, France
- Dr. Hélène Jacqmin-Gadda, Research Director, "Institut National de la Sante et de la Recherche Medicale(INSERM U897)", Biostatistic Group, "Universite Victor Segalen Bordeaux 2", Bordeaux, France
- Dr. Ghada Beaino, Research Assistant,
French National Institute of Health and Medical Research, INSERM-U953,
Epidemiological Research Unit on Perinatal Health and Women’s and Children’s Health, Paris, France.

Aims of the workshop: Studies usually suffer from missing data, also called incomplete observations, which raise problems of bias and precision for the study results. Theoretically, three situations can be described: First, data may be missing completely at random; Second data may be missing depending on earlier observations or predictor variables; Third data may be missing depending on non observed variables. Each of these situations has a different analytical method. Practically, one must make an assumption about incomplete observations in his study, and then analyze data accordingly. Through this workshop, participants will how to model the effect of incomplete observations in a given study and to appropriately discuss results obtained.

Target audience: Biostatisticians and health professionals with experience in statistical and epidemiological analysis

Morning session
9.00 - 10.00 am Challenges of incomplete observations analysis
Mean estimation: the Slovenian plebiscite (MC)
Cross-sectional association coefficient estimation: National Perinatal Study
Prognosis estimation: the APROCO cohort (HJG)
10.00 - 10.30 am Theoretical approach : Taxonomy of missing data (HJG)
10.30 - 11.00 pm Coffee Break
11.00 - 11.30 pm Methods for missing at random (MAR) data (HJG)
11.30 - 12.30 pm MetMultiple imputation for modeling MAR data MICE algorithm (multiple imputation by chain equations) (MC)
Prematurity, previous adverse pregnancy outcome and tobacco in the National Perinatal Study (MC)
12.30 - 2.00 pm Lunch break


<>Afternoon session
9.00 - 10.00 am Challenges of incomplete observations analysis
Mean estimation: the Slovenian plebiscite (MC)
Cross-sectional association coefficient estimation: National Perinatal Study
Prognosis estimation: the APROCO cohort (HJG)
2.00 - 3.00 pm Methods for missing not at random (MNAR) data (HJG)
3.00 - 3.30 pm MNAR data analyses
Measuring success rate of in vitro fertilization: a shared parameter model (MC)
3.30 - 4.00 pm Coffee break
4.00 - 5.00 pm Sensitivity analysis of missing not at random Data (MC)
5.00 - 5.30 pm A STATA application
Prognosis of very preterm infants: the EPIPAGE cohort study (GB)