The Advance Decline line has been around forever, as has the CBOE Put-Call ratio. I divide the AD line by the Put-Call ratio to get a momentum oscillator that provides excellent bullish and bearish divergence signals (for when trends are about the change) as well as positive and negative reversal signals (for when trends are about to continue).
As an example of the latter, compare how the higher momentum peak in the mid-June rally vs. the mid-May rally was unable to produce a higher high in price in June, thus signifying the downtrend was strong and about to continue.
Edit - Terry Laundry published my Advance-Decline momentum oscillator in his September 15, 2010 post at the T Theory Foundation site. He had some nice things to say about my oscillator in his audio comments as well.
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