Day 3 Postmortem

Author

Erik Westlund

Published

June 12, 2025

Video Recording

The video recording can be viewed by clicking here.

The password has been shared via email and CoursePlus.

Support on Zoom

If you have any questions or need any help, please reach out to me via email. If you are a JHU student, faculty, or staff memmber, you can reach me on Teams.

Interaction Effects

I have updated the applications_6_visualizing_correlations_and_models.qmd example to include a section on interaction effects. There are two examples:

A simple categorical by continuous interaction
A more complex scenario with a three-way interaction, one categorical and two continuous variables.

I use the emmeans package with ggplot2 to explore the interaction effects and make sense of them in a way that is very challenging without visualization.

Shiny Dashboard Example

I have added a shiny example to the examples directory. This takes the simulated maternal health data and creates a shiny app that allows you to explore the data. You can run it in RStudio by opening the examples/shiny_example.R file and clicking the “Run App” button.

I opted not to include this in the daily instruction because of time constraints.

Problem Sets/Final Project

Please reach out to me if you need an extension.

---
title: "Day 3 Postmortem"
author: "Erik Westlund"
date: "2025-06-12"
---

## Video Recording

The video recording [can be viewed by clicking here](https://jhjhm.zoom.us/rec/share/_kcjdJzRpr-QhStcLFNbbWBUVekOb2HZtNQLLdWSwNPxTyuSzbxpqp2ywIcfS3zh.6hZJ1hWATbzQAHp_?startTime=1749733850000).

The password has been shared via email and CoursePlus.

## Support on Zoom

If you  have any questions or need any help, please reach out to me via email. If you are a JHU student, faculty, or staff memmber, you can reach me on Teams.

## Interaction Effects

I have updated the [applications_6_visualizing_correlations_and_models.qmd](https://erikwestlund.github.io/data-viz-summer-25/examples/applications_6_visualizing_correlations_and_models.html) example to include a section on interaction effects. There are two examples:

* A simple categorical by continuous interaction
* A more complex scenario with a three-way interaction, one categorical and two continuous variables.

I use the `emmeans` package with `ggplot2` to explore the interaction effects and make sense of them in a way that is very challenging without visualization.

## Shiny Dashboard Example

I have added a shiny example to the `examples` directory. This takes the simulated maternal health data and creates a shiny app that allows you to explore the data.  You can run it in RStudio by opening the `examples/shiny_example.R` file and clicking the "Run App" button.

I opted not to include this in the daily instruction because of time constraints.

## Problem Sets/Final Project

Please reach out to me if you need an extension.