Dow Theory: The Formation of a Line

According to Dow Theory, the formation of a line, the stock market trading in a narrow range, typically portends a major movement in the market once the range is broken through on the upper or lower end of the channel it has traded in. To be specific, Dow Theory indicates that a line is created when both the Dow Jones Transportation and Industrial Averages are in a range of 5% over a period for 8 weeks or more.

In the charts below, neither index has exhibited a narrow range of 5% or less. In addition, from a strictly technical basis, it would be difficult to say that a range has not been broken on the upside in March and April of 2010 for the Dow Jones Industrial Average or the downside in July 2010 for both indexes. However, it is challenging to ignore the general range of 10,700 to 9,750 that the Dow Industrials has traded in since late September 2009. Likewise, the Transportation index has traded in a fairly tight range since mid-May 2010. (more)