Race- and poverty-related disparities in physical function are well documented, though little is known about effects of race and poverty on functional decline and the progression of disability. We examined cross-sectional and longitudinal relationships between race, poverty and lower extremity...

As a greater number of people reach old age, medicine is challenged to develop new approaches to this population. Health promotion, not just treatment of disease but improving the quality of life for older persons, must play a role. What happens to individuals in terms of health status as they...

We propose a test for the stability over time of the covariance matrix of multivariate time series. The analysis is extended to the eigensystem to ascertain changes due to instability in the eigenvalues and/or eigenvectors. Using strong Invariance Principle and Law of Large Numbers, we normalize...

An extensive literature that examines the relationship between family structure and children’s outcomes consistently shows that living with a single parent is associated with negative outcomes. Few studies, however, directly test the relationship between family structure and outcomes for the...