I would agree with Dave... basically if you are looking at a reversal down for example: the days when the stock is rising up, it should show a weakness in volume i.e. show volume decreasing on the up days.... then if we have a nice spike in volume on the down day, then that would confirm a strong chance of that reversal.
For a continuation pattern, a break of support or resistance would be one thing and a good spike in volume would indicate that pressure is on the stock to continue in its direction...
Basically, if you are thinking of going long, you want to see less volume of the days when the stock dropped and greater spikes in volume on the up days. And if you are thinking of going short, you want to see less volume on the days ups and more volume on the days down. But using other indicators can help confirm.
hope that helps :-)
David
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