Overview
Stephen C. Vail is a statistician (George Washington University), co-author of the covariance-models approach for longitudinal overdispersed count data.
Key Contributions / Features
- Covariance models for longitudinal counts (Thall-Vail 1990): with Thall, a GEE/quasi-likelihood family estimating both mean and variance-covariance parameters for correlated overdispersed counts.
Related