This subcontract will fund the effort of Dr. Trivellore Raghunathan which will include providing guidance on the maintenance and use of multiple national data sets to be used by the Research Team at NBER to carry out the proposed research. We will need to produce analytic datasets suitable to address the aims of the project. Many of the data resources that will be used in the project are publicly available and in relatively usable format, but substantial processing is often required to overcome some limitations. Dr. Raghunathan will also develop statistical methodology for missing data, combining data from multiple sources, latent variable modeling and age period cohort analysis. Primary responsibility for the management of Medicare claims data and all data sets needing restricted data use agreement will reside with NBER, while UM will use publicly available data sets for methodological development.