TA: 交易量(Volume)的重要性

定义(Definition of Volume)

Volume: the number of shares or contracts that trade over a given period of time, usually a day. The higher the volume, the more active the security.

To determine the movement of the volume (up or down), chartists look at the volume bars that can usually be found at the bottom of any chart.

为什么重要

Volume is used to confirm trends and chart patterns.

任何上升或下降的趋势(trends)，如果有相应的交易量(高或低)配合的话，那这样的趋势就被视为比较强(strong)趋势，并且可以更持久。

如果Volume和Price不相应移动的话(比如说price increases but volume decreases)，这样的情况叫做Divergence。Divergence发生时， 就代表该趋势(上升或下降)不是真趋势，而且很弱，不会持久。

除了趋势之外，各种图型(chart patterns)，也应该有相应的交易量来伴左。如果图型(比如说head and shoulders, triangles, flags) 的形成没有交易量来支持的话，那该图型也被视为不强，应该 不会持久。

Volume precedes price.
Another important idea in technical analysis is that price is preceded by volume. Volume is closely monitored by technicians and chartists to form ideas on upcoming trend reversals. If volume is starting to decrease in an uptrend, it is usually a sign that the upward run is about to end.

总结与感想

交易量果然举足轻重，除了要来验证趋势和图型的真实和持久性，也可以用来观察股市是否过热或过冷，适合进场还是适合离场。关于后者，以后如果看到适合的文章讨论这个，再贴上来。=)




Venus

ps: Content and pictures in this article are excerpted from Investopedia.