One of the main assumptions of linear regression taught in statistics courses is that of “constant variance” or “homoscedasticity.” Having data that do not have constant variance (i.e., are heteroscedastic) is then often treated as a problem—a nuisance that violates our assumptions and, among other things, produces inaccurate ...

I set out to do two things with this post: Show how one can use workflowsets in the tidymodels context to compare different pre-processing and model types against one another. Until recently, there wasn’t a unified way to do this in the R ecosystem. So, I wanted to give ...

This week was the week of April 14th, the date that shares the (French) name of Aphex Twin’s most well-known work, “Avril 14th.” I have known about Aphex Twin since maybe middle school or so, but I only first really listened in earnest after hearing “Avril 14th” as the ...

Simulating data is an invaluable tool. I use simulations to conduct power analyses, probe how robust methods are to violating assumptions, and examine how different methods handle different types of data. If I’m learning something new or writing a model from scratch, I’ll simulate data so that I ...

Simulating data is an invaluable tool. I use simulations to conduct power analyses, probe how robust methods are to violating assumptions, and examine how different methods handle different types of data. If I’m learning something new or writing a mode...

Welcome from Part 1, where I talked mainly about methods; Part 2, where I discussed the three major types of Star Wars fans; Part 3, where I discussed sexism and political attitudes; and Part 4, where I discussed age and nostalgia. In this part, I will focus on age and nostalgia. As always, email ...

Welcome from Part 1, where I talked mainly about methods; Part 2, where I discussed the three major types of Star Wars fans; and Part 3, where I discussed sexism and political attitudes. In this part, I will focus on age and nostalgia. As always, email [email protected] with questions about ...

Welcome from Part 1, where I talked mainly about methods, and Part 2, where I discussed the three major types of Star Wars fans. In this part, I will focus on sexism and political attitudes. As always, email [email protected] with questions about analyses, methods, results, and so on. It ...

My colleague Isaac Lello-Smith and I wrote a paper on how to obtain valid confidence intervals in R for weighted surveys. You can read the .pdf here and check out the code at GitHub. There are many of schools of thought out there on methods for estimat...