> For the complete documentation index, see [llms.txt](https://easonwang.gitbook.io/finance/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://easonwang.gitbook.io/finance/gu-shi-ji-shu-mian/bu-lin-tong-dao.md).

# 布林通道

## 布林通道 **Bollinger Bands，BBands**

### 解釋：

![](/files/-M0u4UaYuwXof8cn6bNv)

### 三條線的算法為：

![](/files/-M0u4Ua_hVG_Vs_TRmvr)

### 忘記統計學的標準差怎麼算嗎？標準差計算方法為

### ![](/files/-M0u4UabwHxXb0kDoUzE)所以

### ![](/files/-M0u4UadkOrGvKNQBIWU)

## 結論：

```
當 股價到低軌道時，進場做多，

等到股價觸碰到 高軌道時出場，反之亦然。 

所以 在兩個標準差之中，

依據上圖的常態分配，

股價會超出軌道機率大約只有0.046%
```

觀察股價是某超出布林通道的兩個區間可以進行操盤：

![](/files/-M0u4UafxukfjWYEv_sC)操作教學：<https://www.youtube.com/watch?v=cHchHnE5MJs>

> 個人認為波段買賣跟3ma, 5ma 交叉類似

<https://www.cmoney.tw/learn/course/technicals/topic/1216>

<http://estat.ncku.edu.tw/topic/desc_stat/base/std.html>


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