r4ds/model-many.Rmd

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# Working with many models
```{r setup-model, include=FALSE}
library(purrr)
set.seed(1014)
options(digits = 3)
```
i.e. how do tidyr, dplyr and purrr intersect.
* Why use a data frame?
* List columns in a data frame
* Mutate & filter.
* Creating list columns with `group_by()` and `do()`.