Interaction
Variable interaction refers to the multiplication of two variables, which can be numerical variable * numerical variable, or categorical variable * categorical variable.
Combined feature is one of the most important methods in feature engineering. It combines two or more class attributes into one. This is a very useful technique when a combined feature is better than a single feature.
For example, two numerical variables and two categorical variables in the house price data are interacted into combined features respectively
A |
|
1 |
=T("D://house_prices_train.csv") |
2 |
=A1.derive(MSSubClass*LotFrontage:SubClass_LotFrontage,MSZoning+","+LotShape:MSZoning_LotShape) |
A2 Interact two numerical variables to generate "SubClass_LotFrontage" and interact two categorical variables to generate "MSZoning_LotShape"
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