เพิ่มค่าที่ฟิตแล้วให้กับแต่ละโมเดล

best_augmented <- best_fit %>% 
  # Build the augmented data frame for each country model
  mutate(augmented = ___) %>% 
  # Expand the augmented data frames
  ___

worst_augmented <- worst_fit %>% 
  # Build the augmented data frame for each country model
  mutate(augmented = ___) %>% 
  # Expand the augmented data frames
  ___