dummy coded variables
Dear Data Mining and Rapid Miner Experts,
I would like to analyse my dataset which contains categorical (polynominal) predictor variables by Logistic Regression and SVM.
So far I used other Data Mining/ Statistic Software that have transformed my categorical predictor variables automatically by dummy coding using one group as a reference group and getting k-1 new binominal dummy coded variables (when having k groups in the considered attribute).
How can I perform this in Rapid Miner?
If I transform an attribute in k-1 binominal variables manually how will the Logistic Regression or SVM operator know that these are my dummy coded variables? Or do I just have to create k new binominal attributes for modelling...?
Thank you very much.
Lara
I would like to analyse my dataset which contains categorical (polynominal) predictor variables by Logistic Regression and SVM.
So far I used other Data Mining/ Statistic Software that have transformed my categorical predictor variables automatically by dummy coding using one group as a reference group and getting k-1 new binominal dummy coded variables (when having k groups in the considered attribute).
How can I perform this in Rapid Miner?
If I transform an attribute in k-1 binominal variables manually how will the Logistic Regression or SVM operator know that these are my dummy coded variables? Or do I just have to create k new binominal attributes for modelling...?
Thank you very much.
Lara