R中的增强树和可变交互

Question

How can one see in a Boosted trees classification model for machine learning (adaboost), which variables interact with each other and how much? I would like to make use of this in R gbm package if possible.

Answer 1

To extract the interaction between input variables, you can use any package like lm. http://www.r-bloggers.com/r-tutorial-series-regression-with-interaction-variables/

Answer 2

You can use ?interact.gbm. See also this cross-validated question, which directs to a vignette of a related technique from the package dismo .

In general, these interactions may not necessarily agree with the interaction terms estimated in a linear model.