Banach spaces, as complete normed vector spaces, form a central framework in modern functional analysis. Their rich geometric structure underpins much of the theoretical development in approximation ...

A comparison and evaluation is made of recent proposals for multivariate matched sampling in observational studies, where the following three questions are answered: (1) Algorithms: In current ...

We examine the problem of variable selection for high-dimensional sparse Cox models. We propose using a computationally efficient procedure, the Chebyshev greedy algorithm (CGA), to sequentially ...