NRI 7350 - Lab 1

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## NRI 7350
# Getting started with R

![:img center, bottom: 25px, 53%, ,](figures/happy_r.png)

.footnote[[@allison_horst](https://github.com/allisonhorst/stats-illustrations)]

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# Check-in

- Everyone getting emails?
    - Email about these slides?
- Everyone have access to these slides?  
  https://steffilazerte.ca/NRI_7350/slides.html

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# About these Labs

## Format
- I will provide you tools and workflow to get started with R
- I will go over specific statistical functions
    - How to run them
    - How to interpret the results
- We'll have hands-on, lecture, and demonstrations

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## R is hard: But have no fear!
- Don't expect to remember everything!
- Copy/Paste is your friend (never apologize for using it!)
- Consider these labs a resource to return to

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# About these Labs

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## R is hard: But have no fear!
- **Don't expect to remember everything!**
- Copy/Paste is your friend (never apologize for using it!)
- Consider these labs a resource to return to

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# Impost**R** Syndrome

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# Impost**R** Syndrome

![:img left: 25px, bottom: 175px, 60%, , David Whittaker](figures/imposter.jpg)

![:box 50%, 80%, 75%](Moral of the story? Make friends, code in groups, learn together and don't beat yourself up)

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![:img center, bottom: 0, 53%, ,](https://github.com/allisonhorst/stats-illustrations/raw/master/rstats-artwork/r_first_then.png)

.footnote[[@allison_horst](https://github.com/allisonhorst/stats-illustrations)]

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# About R

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# Why R?

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## R is hard

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## But R is powerful (and reproducible)!

.footnote[(I made these slides with **R**markdown)]

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## R is also beautiful

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## R is affordable (i.e., free!)

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# What is R?

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# R is Programming language

> A programming **language** is a way to give instructions in order to get a computer to do something

- You need to know the language (i.e., the code)
- Computers don't know what you mean, only what you type (unfortunately)
- Spelling, punctuation, and capitalization all matter!

## For example

**R, what is 56 times 5.8?**

```r
56 * 5.8
```

```
## [1] 324.8
```

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# Use code to tell R what to do

**R, what is the average of numbers 1, 2, 3, 4?**

```r
mean(c(1, 2, 3, 4))
```

```
## [1] 2.5
```

**R, save this value for later**

```r
steffis_mean <- mean(c(1, 2, 3, 4))
```

**R, multiply this value by 6**

```r
steffis_mean * 6
```

```
## [1] 15
```

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# Code, Output, Scripts

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## Code
- The actual commands

## Output
- The result of running code or a script

## Script
- A text file full of code that you want to run
- You should always keep your code in a script
]

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## For example:

```r
mean(c(1, 2, 3, 4))
```

```
## [1] 2.5
```
]

![:here right: 100px, top: 200px](Code)
![:here right: 100px, top: 250px](Output)

![:here right: 100px, top: 310px](Script)

![:img right: 200px, bottom: 5px, 30%, ,](figures/script.png)

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# RStudio vs. R

![:img left: 15%, top: 125px, 300px, , RStudio](figures/RStudio-Ball.png)
![:img right: 15%, top: 125px, 400px, , R](figures/R.png)

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- **RStudio** is not **R**
- RStudio is a User Interface or IDE (integrated development environment)
    - (i.e., Makes coding simpler)
- But sometimes tries to be **too** helpful

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# RStudio Features

### Changing Options: Tools > Global Options

- General > Restore RData into workspace at startup (NO!)
- General > Save workspace to on exit (NEVER!)
- Code > Insert matching parens/quotes (Personal preference)

## Projects
- Handles working directories
- Organizes your work

## Packages
- Can use the package manager to install packages
- Can use the manager to load them as well, but not recommended
  - Load packages in your script so you remember which ones you used!

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# Let's take a look at RStudio

## Set up a Project for this course

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# Your first *real* code!

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# First Code

<code class ='r hljs remark-code'># First load the package library(tidyverse) # Now create the figure ggplot(data = msleep, aes(x = sleep_total, y = sleep_rem, colour = vore)) + &nbsp;&nbsp;geom_point()</code>

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- Copy/paste or type this into the script window in RStudio
  - You may have to go to File > New File > R Script
- Click anywhere on the first line of code
- Use the 'Run' button to run this code, **or** use the short-cut `Ctrl-Enter`
    - Repeat until all the code has run

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# First Code

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```