Quote from swtrader:
not directly, but i most definately form my market context off of it, ie, what i think the shorter timeframes are trying to fill out, where I think they are ultimately going, or could go - it's why i didnt think that the march rally was 'too high' until it hit the 20 month, although i was kind of surprised how high it went
take a look at what happened in dec 2007, when the spx closed below the 20 month moving average for the first time in years
look at the 20 month moving average on that entire chart. And it's not rocket science - how a market reacts to a 1 and 3/4 year average would be a logical place for the market to ask ('well, is the market in a bull or a bear', and more importantly, answer that question)
Things dont change that much in one year. But they often do in two. Think about the nation's history (and your own, since say 1995)