# RSI 指標

相對強弱指標。

計算方式：

```
有四天是漲的，共漲了 3+2+2+2=9 ，平均下來每天漲 9 / 6= 1.5 (平均漲幅)

有兩天是跌的，共跌了 4+1=5，平均下來每天跌 5 / 6= 0.83 (平均跌幅)
```

## RSI = (1.5/(1.5+0.83))\*100 = 64.3

解釋：

```
1. RSI 的範圍一定在 0-100 之間。

2. RSI 越大代表過去漲比跌多。
```


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