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Gregory Choi
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  • Chicago, IL
  • United States
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Cyberrisk consultant @ Deloitte Chicago
MBA of University of Notre Dame
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Senior Consultant
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Gregory Choi's Blog

[Data Mining] Association Rules in R (diapers and beer)

Posted on August 22, 2016 at 7:30am 5 Comments

[Introduction of Association Rules]

Sometimes, the anecdotal story helps you understand the new concept. But, this story is real. About 15 years ago, in Walmart, a sales guy made efforts to boost sales in his store. His idea was simple. He bundled the products together and applied some discounts to the bundled products. (Now, it became common practices in marketing) For example, this guy bundled bread with jam, so that customers easily found them together. Moreover,…


Multi-Regression in R (Exxon Mobil stock price ~ WTI, Gas, and S&P500)

Posted on May 20, 2016 at 9:05am 1 Comment

[Previous Post]

Single regression on Exxon's stock

[Introduction of Multi-regression]

Let's recall our last job. We conducted the single regression on Exxon Mobil's stock along with WTI crude oil spot price. The result was fantastic, which accounts for 25% of the variation of stock movement. Put it in other way, R-square. The problem is "are you happy with the…


Introduction to Machine Learning / Data Mining

Posted on April 7, 2016 at 4:30pm 0 Comments

Machine Learning? Data Mining?

Well, there is a little bit difference between machine learning and data mining although I don't see any difference between them.

See the Stackexchange debate on the difference between machine learning and data mining.

At the end, it is about training the machine to…


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