Challenge #157: An Expert Challenge
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Wow. So not ready for the Expert Exam...yet. I would have spent my entire exam time researching the tools for this. The difficult part is knowing which predictive tools to use. Went down a rabbit hole to combine results and calculate Chi-Squared until I revisited the tool documentation for predictive tools and found the Nested Test tool. I wish I had Alteryx with these tools in college (soooo long ago).
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Pardon me if I'm confused, but what does a question like this have to do with a designer certification? Find the answer to that, and you'll know why most people avoided it.
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Cool challenge! I have no idea if my solution is anywhere near correct, but enjoyed getting there nonetheless!
Determining the Mean Decrease Gini Coefficient means a Forest model (see the same article that many of us found here)
Variables outlined in the red box below
2 Logistic regressions, one with F_38 and one without. And a Nested Test to compare the two models. Chi-squared is in the nested test
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Whew, had to spend some quality time with the tool documentation on this one. Statistically, this was out of my depth, however, I was totally surprised to find that I was actually close to the right path.
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Facing my old nemesis from the expert exam! I am one of the people who attempted this one. LOL @CristonS you won't believe what I did...
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Community resources to the rescue!!!
Clearly, I now know what I should be doing for the next two months until the Expert exam at Inspire Nashville...
Cheers!
NJ
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Thanks to @patrick_digan for showing me where this variable importance plot was hiding.
My solution attached