Below is a quick reference sheet for R-markdown. It is primarily taken from the R-stuido guide on Markdown Basics and R Markdown: The Definitive Guide.

Emphasis

*italic*   **bold**

_italic_   __bold__

Headers

# Header 1

## Header 2

### Header 3

Lists

Unordered List:

* Item 1
* Item 2
    + Item 2a
    + Item 2b

Ordered List:

1. Item 1
2. Item 2
3. Item 3
    + Item 3a
    + Item 3b

R Code Chunks

R code (ie anything with {r}) will be evaluated and printed

```{r}
summary(cars$dist)
summary(cars$speed)

Inline R Code

There were `r nrow(cars)` cars studied

Use a plain http address or add a link to a phrase:

http://example.com

[linked phrase](http://example.com)

Images

Images on the web or local files in the same directory:


![](http://example.com/logo.png)

![optional caption text](figures/img.png)

Blockquotes

A friend once said:

> It's always better to give
> than to receive.

Plain Code Blocks

Plain code blocks are displayed in a fixed-width font but not evaulated

This text is displayed verbatim / preformatted

Inline Code

We defined the `add` function to
compute the sum of two numbers.

LaTeX Equations

LaTeX Equations
Inline equation:

$equation$
Display equation:

$$ equation $$

Horizontal Rule / Page Break

Three or more asterisks or dashes:

******

------

Tables

First Header  | Second Header
------------- | -------------
Content Cell  | Content Cell
Content Cell  | Content Cell

A [linked phrase][id].

At the bottom of the document:

[id]: http://example.com/ "Title"

Images

![alt text][id]

At the bottom of the document:

[id]: figures/img.png "Title"

Manual Line Breaks

End a line with two or more spaces:

Roses are red,  
Violets are blue.

Miscellaneous

superscript^2^

~~strikethrough~~