Exercise

# Glance at the fit of your models

In this exercise you will use `glance()`

to calculate how well the linear models fit the data for each country.

Instructions

**100 XP**

- Append a column (
`fit`

) containing the fit statistics for each model to the`gap_models`

dataframe and save it as`model_perf_nested`

. - Simplify this dataframe using
`unnest()`

to extract these fit statistics of each model and save it as`model_perf`

. - Finally, use
`head()`

to take a peek at`model_perf`

.