We systematically assessed the effects of mattress firmness on sleep, pain, and daytime functioning, finding that mattress firmness has statistically significant effects on both sleep and daytime functioning and that individuals varied widely in the mattress that optimized their sleep. A...

We consider spectral decompositions of multiple time series that arise in studies where the interest lies in assessing the influence of two or more factors. We write the spectral density of each time series as a sum of the spectral densities associated to the different levels of the factors. We...

A class of mixtures of structured autoregressive (AR) models and methods for sequential estimation within this class of models are considered. Such models and methods are motivated by the analysis of electroencephalogram (EEG) signals recorded during a cognitive fatigue experiment. Specifically,...

Assessing the selective influence of amino acid properties is important in understanding evolution at the molecular level. A collection of methods and models has been developed in recent years to determine if amino acid sites in a given DNA sequence alignment display substitutions that are...