By the way, this graph indicates a perfect example of how ta itself is very subjective.
Notice how the RSI and Nasdaq were both mathematically convergent from 10/06 right up to 11/06, the market pulled back, but there was no divergent signal. No matter how you fine tune the period of the indicator, there will be times when it outright fails to predict future moves. I haven't done longer periods, but they would likely be slightly more predictive and robust.
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"Patterns are the fool's gold of the financial markets... They are the inevitable need for humans to seek to find patterns in the patternless." Mandelbrot