Learn my 10-step process of how to start a business while keeping a full-time day job, from someone who's successfully done it. What's your side business?
On July 3 1884 Charles Henry Dow together with his colleague Edward Jones composed and published an stock average - called the Dow Jones Railroad Average -, which contained nine railroads and two industrial companies. He developed the stock index as part of his market research and it was meant to serve as a reference value to determine fluctuations of the stock market.
Y. Chen, F. Tsai, и K. Chan. DDDM '07: Proceedings of the 2007 international workshop on Domain driven data mining, стр. 55--60. New York, NY, USA, ACM Press, (2007)