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I don't know much about this, but I looked them up and it's interesting how well the two compare: https://www.google.com/finance?q=INDEXSP%3A.INX%2C+INDEXDJX%3A

• parenthesis 12y ago
  Yes, the calculation of the Dow Jones is a complete joke, but, funnily enough, it has tracked the fairly sensibly calculated S&P 500 surprisingly closely over time.
  • maaku 12y ago
    No, it hasn't. The two diverge greatly over long windows.
• stygiansonic 12y ago
  The correlation between SPX and the DJIA will generally be quite high, because sampling 30 stocks (and generally those with the biggest market caps) gives you a good estimate/representation. As a result, over short periods of time, the spread between the two will be relatively small. Over long periods of time however, the spread can be significant. See the following: 1. http://avondaleam.com/dow-jones-vs-sp/ http://avondaleam.com/dow-jones-vs-sp/ 2. http://www.thumbcharts.com/101035/DJIA-vs-S-P-500 http://www.thumbcharts.com/101035/DJIA-vs-S-P-500 (Compare 1, 2, 3 and 5 years)