Meeting Details  
Date June 14, 2022
Time 18:00
Location DeVos 107D
Grand Valley State University: Pew Campus
401 Fulton St W, Grand Rapids, MI 49504
Parking DeVos lot and ramp

GVSU’s Statistics department is providing Jimmy Johns.

Thanks Paul! Go to this link by June 8 to RSVP/specify your sandwich order for the meeting. It appears you’ll need to be logged into a google account before clicking on the link, at least it did for me. If you have trouble, email me ( or Bradford ( and we’ll get you signed up.


We are excited to return to in person meetings the second Tuesday of June on GVSU’s DeVos campus downtown.

Visualizations for Non-trivial Linear Models

Classroom examples and problems for most users of statistics seldom go beyond a simple two factor fixed effects linear model while real research is more often a mixture of fixed and random effects as well as continuous covariates. Statisticians readily work with these more advanced models, but researchers, particularly graduate students outside of statistics generally need help understanding what these statistical models are telling them. Visualizations greatly aid in understanding interactions, fixed versus random effects and the interplay between continuous and categorical factors. We will look at a couple of examples of models from the GVSU Biomechanics lab and how visualizations in R have helped graduate students in the Physical Therapy program to understand their data.

Presenter: David Zeitler, PhD Foundation Stochastics LLC

Presenter Bio:

Dr. Zeitler retired in 2020 from Grand Valley State University where he taught statistics for 17 years after having worked in West Michigan industry for 23 years. Today he continues to advise Physical Therapy research groups working in the GVSU Biomechanics lab and works part time through his own company Foundation Stochastics, LLC. He is co-organizer of the West Michigan R Users Group and a member of the advisory board as well as program co-chair for the Big Data Ignite conferences in Grand Rapids, Michigan.