This is just an example of how to include youtube videos on an html report.

Basically you use **knitr** through Rstudio. Then you add the video using *iframe* html tag directly:

```
<iframe width="560" height="315" src="http://www.youtube.com/embed/9bZkp7q19f0?rel=0" frameborder="0" allowfullscreen></iframe>
```

And this is the result:

Well, *knitr* is really made to include R code

```
summary(cars)
```

```
## speed dist
## Min. : 4.0 Min. : 2
## 1st Qu.:12.0 1st Qu.: 26
## Median :15.0 Median : 36
## Mean :15.4 Mean : 43
## 3rd Qu.:19.0 3rd Qu.: 56
## Max. :25.0 Max. :120
```

```
plot(cars, col = "blue")
```

and some math.

\[ f_Z(z) = \frac{1}{\sqrt{2 \pi}} \exp \left( - \frac{z^2}{2} \right) \]

More here!