Musings, Explorations, and Announcements

Last Friday at the Davis R Users’ Group, Grace Charles gave a presentation on structural equation modeling in R using the Lavaan package. Here’s the video and her slides. We’ve also posted Grace’s script from the presentation as a gist here. More resources that Grace mentioned in her talk below.

Resources

• Jim Grace’s website at USGS
• A Lavaan tutorial vingette by Yves Rosseel
• Materials from Jarret Byrnes’ short course

Last Fr Davis R Users’ Group, Jaime Ashander gave a presentation on and visualizing and diagnosing (G)LMMs in R. Here’s the video: Jaime also wrote up the notes from his talk, including all the code, on his blog here (with the raw R Markdown file on github here). The material in the blog post is expanded and improved upon from the original talk, though this means the video and posted code don’t match exactly.

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Today at the Davis R Users’ Group, Michael Koontz gave tour de force lesson in using R’s base graphics capabilities to plot data. Here’s the video:

Get Michael’s excellent annotated script, which covers much more than we got to during our tutorial, here.

Last week at the Davis R Users’ Group, Myfanwy Johnston gave an introduction to the powerful and ubiquitous ggplot2 package for plotting in R. See below for the screencast and her particularly enlightening figure of how ggplot’s syntax and conceptual approach. Myfanwy also placed all her slides, code, and links to more ggplot resources in this GitHub repository. (In a D-RUG first, there was an actual small fire that occurred between ~23:10 - 25:40.

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Today at the Davis R Users’ Group, Ryan Peek and Michele Tobias gave an introduction to making maps in R. Here’s the webcast:

(Pardon the little scuffle at the beginning and as we switched computers halfway through. Still getting the hang of hangouts.)

Resources:

• Download all of Ryan’s code and HTML files here.
• See Michele’s slides on Slideshare here.
• Code for Michele’s example maps in her GitHub. repository.