强力指数指标(Force Index - FRC)

强力指数技术指标由Alexander Elder开发，这个指标测算每一次增加的牛力震荡指标和每一次减少的牛力震荡指标。它与最基本的市场信息要素相关联：价格趋势，价格趋势的下跌，以及外汇交易量。这个指标可以就其作用来进行使用，但是最好和平均指标配合使用，与长期平均指标一起使用，有助于发现入市和退市的最好时机。与短期平均指彪一起使用，（时段13）该指标会显示市场趋势和其变动情况。

当强力指标在指标增加趋势的时段内是负值时（小于零），是买入外汇比较好的时候;

当强力指标标志着增加的趋势会持续时，它会上升到一个新的高峰;

当强力指标在下降趋势的时段内变为正值时，卖出的信号就到来了;

当强力指标下降到一个新的低谷时，它就标志着熊力的到来和不断减少的趋势的持续;

如果价格的变化不与相应的成交量的变化相关联的话，强力指标仍旧保持在一个水平上，这就意味着告诉你趋势很快就会变化。

计算方法：

方向，成交量和规模是每个市场移动力量的主要特征。如果当前柱的收市价格高于上一个柱的价格，强力指数是正值，假如当前柱的收市价格低于上一个柱的价格，那么强力指数是负值。两个数值的差额越大，则强力指标就越大；交易量越大，强力指标就越大。

FORCE INDEX (i) = VOLUME (i) * ((MA (ApPRICE, N, i) - MA (ApPRICE, N, i-1))

注释:

FORCE INDEX (i) - 当前柱的力量指数；

VOLUME (i) - 当前柱的交易量；

MA (ApPRICE, N, i) - 在任何一个时段内当前柱的任何移动平均线: 简单，指数，权数或者通畅;

ApPRICE - 应用的价格；

N - 顺畅的时段；

MA (ApPRICE, N, i-1) - 前一柱的任何移动平均线。

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