Back in the early days of the pandemic I though “I’ll have a pandemic project”. I never did my pandemic project. But I did think briefly about what it would be. I want to get the types of models I like to use in everyday life efficiently implemented inside Stan. These models encapsulate (generalised) linear mixed models1, (generalised) additive models, Markovian spatial models2, and other models. A good description of the types of models I’m talking about can be found here. Many of th...