ARTICLE SYNOPSIS ...The Haurlan index, which was originated by the Trade Levels, Inc., advisory service, has received comparatively little attention unfortunate, as it has proved to be effective in signaling tops and bottoms. By Paul E. Carroll The number of advancing and declining stocks each day provides the raw data for a variety of breadth indicators and trading systems, among which are the advance-decline line, the McClellan oscillator, the Nicoski index (advancing stocks divided by declining stocks) and the Bolton-Tremblay indicator, to mention only a few. And then there is the Haurlan index. I have found...