Notes A

Intro to R and RStudio

Tip

A comprehensive list of markdown syntax can be found at https://quarto.org/docs/authoring/markdown-basics.html.

In-lab Examples

Markdown Syntax	Output
*italics*	italics
**bold**	bold
***bold italics***	bold italics
- chai tea - green tea - earl grey tea	chai tea green tea earl grey tea
[this is the text that will display](www.google.com)	this is the text that will display
	a caption here

---

R chunks

To create a R chunk:

• use the +C green buttom in the top menu
• Mac Shortcut: CMD + OPTION + I
• PC shortcut: Ctrl + ALT + I
• manually type out ```{r}… etc.

Calculations and R code goes inside chunks.

2+2

[1] 4

Commenting inside an R chunk:

# anything behind a "#" in an R chunk is a comment

Assigning a value to an object:

# this takes the value of 20 and assigns it to the object x
x <-11

Operations with objects:

# take the object x, multiply by 2, and spit out the answer
y <- x*2
y

[1] 22

Creating a vector:

z <- c(1.778, 1.53, 1.58, 1.56)
# c stands for concatenate -- a fancy computer science word for "put together"

z_inches <- z*39.701

# This calculates the mean of z
mean(z, na.rm=TRUE)

[1] 1.612

# This calculates the standard deviation of z
sd(z)

[1] 0.1125581

Equations

Centered and large equations

Type in the plain text section:

$$y=\frac{x^2}{SE(x^2)} $$

Displays as:

\[y=\frac{x^2}{SE(x^2)} \]

Hint: Some people like to use the visual editor to insert equations

Inline equations

Type in the plain text section:

We take and calculate the standard error $SE(x_1)$.

Displays as:

We take and calculate the standard error \(SE(x_1)\).

Inline code

Type in the plain text section:

This is a sentence. The value of x is `r x`

Displays as:

This is a sentence. The value of x is 11.