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Dowser
Here's a curve fitting exercise worth trying. Set your DOW chart to monthly and draw two Exponential Moving Averages (EMAs) on it. Set one to '12' and the other to '14'. Now add the MACD indicator below it. We can use the MACD to highlight and amplify the difference between the two EMAs by setting the fast line to 12 and the slow line to 14 (ignore the signal line and the histogram, in fact make them disappear if you can). I've done this on the chart below and for the last 30 years it's given a good indication of the various swings of Bull and Bear markets (mostly Bull!) Basically, Bull markets are indicated when the fast EMA (the red one on my chart) is above the slow EMA (the black one). Vice versa for Bear markets. This is reflected by the MACD too, as you'd expect - Bull markets are Green and Bear markets Red. What I'm trying to show, is that the next stock market crash won't develop on a daily chart whose indicators are probably calculated from the last 20 - 30 closes. You need to take a step back and look at the bigger picture - if curve fitting has any value at all!