1. SMA: not discriminate in different price values but just calculate their average in a simple manner, 无任何加权, 较少利用.

2. EMA: 指数加权

3. WMA: 线性加权

In general, EMA比WMA更加灵敏，更多的反映最近的价格波动，对于比较长的时间段用EMA比较合适，而较短时间内EMA容易受到噪音或者价格快速波动的影响而产生误导，因此采用WMA比较合适。

接下来看看 Period 对 Weightage 的影响
WMA sequence: 1, 2, 3, 4, 5...............
EMA sequence: 1, 1.2, 2.4, 3.4, 4.7, 6.2............

由此可见时间周期越长，两条 MA 的差距也就越大。

Slope 如下图所示: It shows dotted line having negative slope and white line with postive slope.Whereas green line is with zero slope.Hence the moveing average has changed its slope after passing through tangent point.

Repulsion of Moving Averages
When a moving average fails to pass through another moving average and instead starts going away from it, the phenomenon is called repulsion.
Many traders call this phenomenon as bounce.There is no difference in bounce and repulsion except terminology.
The word bounce seems more sportive in nature and repulsion is a scientific term.We know that two magents or two electric charges either attract eachother or repulse eachother.

思考: 市场正如下面这张图一样，具有很大的欺骗性，如果只相信自己的眼睛，只跟着感觉走，最终注定是要完蛋的。一定要理性的学习和分析其内在规则，才能存活下来，06年的试水过程惊心动魄，在保持小胜的情况下开始了一段 long break, 当前阶段只看不做，等战技术水平提高到下一个层次才考虑再次入场。