**[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,…

Added by Gregory Choi on August 22, 2016 at 7:30am — 5 Comments

**[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…

Added by Gregory Choi on May 20, 2016 at 9:05am — 1 Comment

**Previous Relevant Posts**

- Single regression with R to identify relationship between WTI and stock price of Exxon
- Getting stock volatility in R & Getting Histogram of returns

**What is CAPM?**

According to the investopedia (…

ContinueAdded by Gregory Choi on April 27, 2016 at 10:41am — No 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…

Added by Gregory Choi on April 7, 2016 at 4:30pm — No Comments

**[The goal of this page]**

When I have read all R introductions, the books were filled with just instructions. The goal of R is to solve our real life problem. That's why I want to minimize this page. In the real though, we need to understand some key concepts that might be useful for you to tackle the real life problem. Here's basic data structures and data manipulation method.

Still, I believe the best way to learn R programming language is to tackle the real life…

Added by Gregory Choi on April 6, 2016 at 8:53am — 4 Comments

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