rulefit
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Implement interaction effect measures
interact: overall strengths of interaction effects for selected variables
http://statweb.stanford.edu/~jhf/r-rulefit/RuleFit_help.html#rulefit
Also: twovarint: two-variable interaction strengths of a target variable with selected other variables
and: threevarint: three-variable interaction strengths of two target variables and selected other variables