  model = knn_spec, 
          split = ames_split) %&gt;% 
  collect_metrics()
## # A tibble: 2 x 3
##   .metric .estimator .estimate
##   &lt;chr&gt;   &lt;chr&gt;          &lt;dbl&gt;
## 1 rmse    standard   59074.   
## 2 rsq     standard       0.485
```
]

.pull-right[
`lm_spec`

```
## # A tibble: 2 x 3
##   .metric .estimator .estimate
##   &lt;chr&gt;   &lt;chr&gt;          &lt;dbl&gt;
## 1 rmse    standard   53885.   
## 2 rsq     standard       0.568
```
`rt_spec`

```
## # A tibble: 2 x 3
##   .me