> Estimate a classification or regression tree
To create a tree model, first select the type (i.e., Classification or Regression), response variable, and one or more explanatory variables. Press the `Estimate model` button or `CTRL-enter` (`CMD-enter` on mac) to generate results.
### Report > Rmd
Add code to _Report > Rmd_ to (re)create the analysis by clicking the icon on the bottom left of your screen or by pressing `ALT-enter` on your keyboard.
If either a `Prune` or `Importance` plot was created it can be customized using `ggplot2` commands (e.g., `plot(result, plots = "prune", custom = TRUE) + labs(x = "# nodes")`). See _Data > Visualize_ for details.
It is not currently possible to add a title or caption directly to a `Tree` plot.
### R-functions
For an overview of related R-functions used by Radiant to estimate classification and regression trees see _Model > Classification and regression trees_
The key function from the `rpart` package used in the `crtree` tool is `rpart`.