Department of Statistics Seminar
North Carolina State University

presents

Murali Haran

FROM the Department of Statistics 

Penn State University

Title: A projection-based approach for modeling non-Gaussian spatial data

Abstract

 Non-Gaussian spatial data arise in a number of disciplines. Examples include spatial data on disease incidences (counts), and satellite images of ice sheets (presence-absence). Spatial generalized linear mixed models (SGLMMs), which build on latent Gaussian processes or Gaussian Markov random fields, are convenient and flexible models for such data and are used widely in mainstream statistics and other disciplines. For high-dimensional data, SGLMMs present significant computational challenges due to the large number of dependent spatial random effects. Furthermore, spatial confounding makes the regression coefficients challenging to interpret. I will discuss projection-based approaches that reparameterize and reduce the number of random effects in SGLMMs, thereby improving the efficiency of Markov chain Monte Carlo (MCMC) algorithms for inference. Our approach also addresses spatial confounding issues. This talk is
based on joint work with Yawen Guan (SAMSI/NC State) and John Hughes (U of Colorado-Denver).

Friday, 13 October, 2017
10:30-11:30 am
G20 Kamphoefner Hall

Refreshments will be served in the SAS Hall 5th floor commons at 10:00am