A two-stage generalized least squares model is developed for estimating the linear regression of an individual outcome on a group characteristic in studies of multilevel data. This model differs from ...

Joint mean-covariance regression modeling with unconstrained parametrization for continuous longitudinal data has provided statisticians and practitioners with a powerful analytical device. How to ...

Correlation analysis in portfolio management design is overrated. There isn’t much benefit derived from relying on low correlation among asset classes to achieve excess return. The best way to use ...