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对波动率的观测
博客又很长时间没写了,其实平时和同学朋友聊天,多是观点的输出,而技术层面的东西,多是在自我的把握了。
期权交易最重要的是隐含波动率,但是隐含波动率本身并非是可观测的量,可观测的量只是价格。这也就是所谓的,隐含波动率就是把一个错误的数字放倒一个错误的公式,得到一个正确的价格了。
这里不说隐含波动率,说下我们能到到的已实现波动率。
实际上,已实现波动率也很懒说是一个客观的量,因为取样频率不同,已实现波动率就不同了,就和我们大家说的,被平均了一样。不过我认为,只要固定观测窗口,所得到的值就是有意义的。
曾经在股灾前,我放了一个类似下面的图片,我怕认为波动率还要增加,最后股灾发生了,波动率自然而言的增加了,这不是说我预测到了股灾很快就要发生,只是我当时推测无论如何后续涨跌,波动率是在一个上行通道中。
同样的,在今天这个感觉整个市场风雨欲来的时间点,我在放上两张张波动率的图片。
下面一个是日内利用 5 分钟数据计算得到的日内波动率数据,上面的极值点一般是 IH 跳空高开低开引起的。
尽管目前 C2C 的波动率有一路上行趋势,但是我认为从日内来看,虽然振幅在增加,但是没有看到逐步抬升的趋势线。
对此,我认为,市场的走向就是,日内波动不大,但是跳空风险增加,有点趋向美国市场那种波动一步到位的情形,这是不是说明,至少在 50 股票上,去散户化已经完成了。