This is a really interesting post. I have to say the data science team at Stitchfix are clearly doing really good, applied work that is central to their business. It's so cool to see.

Here's a tip for any R users who read through the code and (like me) is pained by repetition. Instead of using

    library(lubricate)
    library(bts)
    library(...)

Just use apply!

    packages <- c("lubricate", "bts", "...")
    lapply(packages, library, character.only = TRUE)