```
\begin{align}
Bias = \frac{1}{n} \textstyle \sum_{i=1}^{n} \varepsilon_{i}
\end{align}
```

```
\begin{align}
Bias = \frac{1}{n} \displaystyle \sum_{i=1}^{n} \varepsilon_{i}
\end{align}
```

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# [LaTeX] Sum equation in LaTeX

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```
\begin{align}
Bias = \frac{1}{n} \textstyle \sum_{i=1}^{n} \varepsilon_{i}
\end{align}
```

```
\begin{align}
Bias = \frac{1}{n} \displaystyle \sum_{i=1}^{n} \varepsilon_{i}
\end{align}
```