Kevin Gray

Kevin Gray shares some tips he's picked up after more than 30 years experience as a marketing researcher and statistician.

Innovation can come in an assortment of shapes and sizes, including new forms of working arrangements.

Introducing MR Realities, a series of podcasts focusing on the realities of Market Research.

In a recent 12-week smoking cessation trial, varenicline tartrate failed to show significant improvements in enhancing end-of-treatment abstinence when compared with placebo among adolescents and young adults. The original analysis aimed to assess the average effect across the entire population using timeline followback methods, which typically involve overdispersed binomial counts. We instead propose to investigate treatment effect heterogeneity among latent classes of participants using a Bayesian beta-binomial piecewise linear growth mixture model specifically designed to address longitudinal overdispersed binomial responses. Within each class, we fit a piecewise linear beta-binomial mixed model with random changepoints for each study group to detect critical windows of treatment efficacy. Using this model, we can cluster subjects who share similar characteristics, estimate the class-specific mean abstinence trends for each study group, and quantify the treatment effect over time within each class. Our analysis identified two classes of subjects: one comprising high-abstinent individuals, typically young adults and light smokers, in which varenicline led to improved abstinence; and another comprising low-abstinent individuals for whom varenicline showed no discernible effect. These findings highlight the importance of tailoring varenicline to specific participant subgroups, thereby advancing precision medicine in smoking cessation studies.

The Hotel's King Cole Bar Debuted the Drink in 1934

Kevin Gray joined the Travel & Leisure team in 2024.

The vibrant, historic city is one of North America’s most exciting places to sip good cocktails, wines and more. See for yourself at the best bars in Quebec City.

The hospitality group has more openings planned for South Florida and beyond, including Houston, Dallas, Nashville, Tenn., and Kansas City, Mo.

Fresh tortillas from a weekend buffet, sushi at the top of Reunion Tower, and more places to spend your late morning (or early afternoon).

Dubbed Momento by Ikaro, the new restaurant blends its chefs’ Ecuadorian and Spanish roots with local flavors