Understanding Fibonacci Retracement by Ipek Ozkardeskaya of LCG http://www.financial-spread-betting.com/spreadbetting/LCG-compare.html Fibonacci levels are commonly used in determining technical levels in forex and indices trading. In this video, learn how to apply Fibonacci retracements to your trading. The Fibonacci sequence is a series of number that seems to constantly occur in nature.
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My opinion, when i saw the study i agreed and disagreed with Brent Penford; If you saw the histogram concluded from the study you can see that the level range of (38.2 to 61.8) is strong as a ZONE but not as individual levels. one can rely on this zone to increase the probability of a retracement and if price moved beyond this zone you can ignore this as a retracement.
you can find the study in the book"The Universal Principles of Successful Trading"