NEW YORK ( ETF Expert) -- I've listened to scores of prognosticators interpret "Dow Theory" in a variety of different ways.However, all of them may agree upon one disconcerting reality; specifically, the year-long relative weakness in the Dow Jones Transportation Index could be cause for some concern. While I do not believe in the semi-simplistic notion that the transportation stocks must lead the way for industrial stocks, I do pay attention when the iShares DJ Transports ( IYT) lags the SPDR Dow Jones Industrials ETF ( DIA). The best way to spot trends in that relationship is with the IYT:DIA price ratio.
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