Welcome

Hi! I am Chris Desjardins.

I am an assistant professor of mathematics and statistics at St. Michael's College and an associate research scientist and data analyst at Oregon Research Institute. I am interested in data visualization, data science, applied statistics, and statistics education.

Handbook of Educational Measurement and Psychometrics Using R

Okan Bulut and I wrote a book (and an R package) on using R for educational measurement. Topics include: classical test theory; generalizability theory; the factor analytic approach in measurement; unidimensional, multidimensional, and explanatory item response modeling; test equating; visualizing measurement models; measurement invariance; and differential item functioning.

Selected Data Visualizations

Shiny

• Minnesota Study Survey

  This dashboard shows student performance at the school-level on various domains measured on the Minnesota Study Survey. The target audience was school administrators.

• Visualizing Atlantis Diagnostic Tool

  This app (and associated R package) were created to help Atlantis modelers better understand and tune their models.

• Lock5 Data Explorer

  A simple data viewer for the datasets contained in Lock5 for introductory statistics students.

Tableau

• Change in Abortions from 2020 to 2023

  A recreation of a NY Times visualization to demonstrate to my students how quickly dashboards can be created in Tableau.

• Tracking COVID-19 in Vermont

  A COVID-19 dashboard for Vermont for prospective public health students.

Selected R Packages

• profileR

  A suite of multivariate methods and data visualization tools that implement profile analysis and cross-validation.

• ctools

  An extension for jamovi to make it more friendly for introductory statistics students using the Lock5 textbook.