I'm pretty sure Murphy covers that in his book. Revisit the section on Descending triangles. What you do is measure the distance of the height of the triangle and then project that distance down (using a logarithmic chart) from the base of the triangle to give you a target price. What I do then is look for other support possibilities in that area such as moving averages or previous support/resistance points. That generally gives me a range of where the price might turn back around but, remember it's only a target price. The actual price to buy at can't really be determined (in my opinion) until the hourly and/or 15-minute charts are providing a nice buy signal of some kind.
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