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SUBMIT YOUR IDEAA very very tough one! I had to google around to find out where to get the Variable importance plot. Normally, I will use Association Analysis to select the most important variables, dont know that we can use Forest Model to select variables. Then how to compare 2 models based on the Chi-square is another challenging task. In the past, i only used Model Comparison or Lift Chart, never thought of using Nested Test. It will be a very long journey before i can take the Predictive Master Cert. Thanks for the challenge. Hope that we can have more similar challenges soon.
Here's my solution.