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Tom West

The correct thing to do here is plot Dow 1928/29 on the x-axis, and Dow 2012/14 on the y-axis. That would reveal any correlation much better.

Shawn Shafer

And here I thought the correlation showed that the market grows over time.

Hig

Seems like your replot of the data is good, and you could simplify by giving it truly a single y-axis... say proportional change relative to Jan 1 or something like that. It would look identical to yours, but emphasize that the volatility observed in '28 & '29 isn't being seen today.

I get what you're saying about dual axes on the first viral chart. However I think the more dramatic sin is one of extreme cherry-picking. If you're looking for a time-period to compare '28 & '29 to, you could pick any period, say the 2 years after July 2nd 1983. Given enough patience or an algorithm that looked for meaningless correlation, you could probably do even better than this particular comparison.

Kaiser

Hig: The second version is not my work but that of the Atlantic blogger. Just thought I should clarify that.

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Kaiser Fung. Business analytics and data visualization expert. Author and Speaker.
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