class: center middle main-title section-title-6 # Data basics --- class: middle section-title-inv-6 .box-6.large[Packages] --- <figure> <img src="img/01-class/02/packages-base.png" alt="R packages, base" title="R packages, base" width="100%"> </figure> --- <figure> <img src="img/01-class/02/packages-packages.png" alt="R packages, other" title="R packages, other" width="100%"> </figure> --- class: title title-6 # Using packages .pull-left[ ```r install.packages("name") ``` .box-inv-6[Downloads files<br>to your computer] .box-inv-6[Do this once per computer] ] -- .pull-right[ ```r library("name") ``` .box-inv-6[Loads the package] .box-inv-6[Do this once per R session] ] --- class: title title-6 # The tidyverse .pull-left[ .box-inv-6.small["The tidyverse is an opinionated collection of R packages designed for data science. All packages share an underlying design philosophy, grammar, and data structures."] .box-inv-6[… the tidyverse makes data science faster, easier and more fun…] ] .pull-right[ <figure> <img src="img/01-class/02/tidyverse.png" alt="The tidyverse" title="The tidyverse" width="100%"> </figure> ] --- class: title title-6 # The tidyverse <figure> <img src="img/01-class/02/tidyverse-language.png" alt="tidyverse and language" title="tidyverse and language" width="100%"> </figure> ??? From "Master the Tidyverse" by RStudio --- class: title title-6 # The tidyverse package .center[ ```r library(tidyverse) ``` ] .box-inv-6[The tidyverse package is a shortcut for<br>installing and loading all the key tidyverse packages] --- .pull-left[ ```r install.packages("tidyverse") ``` .tiny[ ```r install.packages("ggplot2") install.packages("dplyr") install.packages("tidyr") install.packages("readr") install.packages("purrr") install.packages("tibble") install.packages("stringr") install.packages("forcats") install.packages("lubridate") install.packages("hms") install.packages("DBI") install.packages("haven") install.packages("httr") install.packages("jsonlite") install.packages("readxl") install.packages("rvest") install.packages("xml2") install.packages("modelr") install.packages("broom") ``` ] ] -- .pull-right[ ```r library("tidyverse") ``` .tiny[ ```r library("ggplot2") library("dplyr") library("tidyr") library("readr") library("purrr") library("tibble") library("stringr") library("forcats") ``` ] ] --- class: middle section-title-inv-6 .box-6.large[Rectangular data] --- class: title title-6 # Data frames and tibbles .box-inv-6.medium[Data frames are the most common kind of data objects; used for rectangular data (like spreadsheets)] -- .box-6[Data frames: R's native data object] -- .box-6[Tibbles (`tbl`): a fancier enhanced kind of data frame] -- .box-6.small[(You really won't notice a difference today)] --- class: middle section-title-inv-6 .box-6.large[Vectors and lists] --- class: title title-6 # Vectors .box-inv-6[Vectors are a list of values of the same time<br>(all text, or all numbers, etc.)] .box-inv-6[Make them with `c()`:] ```r c(1, 4, 2, 5, 7) ``` -- .box-inv-6[You'll usually want to assign them to something:] ```r neat_numbers <- c(1, 4, 2, 5, 7) ``` --- class: title title-6 # Basic data types <table> <tr> <td><b>Integer</b></td> <td>Whole numbers</td> <td><code class="remark-inline-code">c(1, 2, 3, 4)</code></td> </tr> <tr> <td><b>Double</b></td> <td>Numbers</td> <td><code class="remark-inline-code">c(1, 2.4, 3.14, 4)</code></td> </tr> <tr> <td><b>Character</b></td> <td>Text</td> <td><code class="remark-inline-code">c("1", "blue", "fun", "monster")</code></td> </tr> <tr> <td><b>Logical</b></td> <td>True or false</td> <td><code class="remark-inline-code">c(TRUE, FALSE, TRUE, FALSE)</code></td> </tr> <tr> <td><b>Factor</b></td> <td>Category</td> <td><code class="remark-inline-code">c("Strongly disagree", "Agree", "Neutral")</code></td> </tr> </table> --- class: middle section-title-inv-6 .box-6.large[Importing data] --- class: title title-6 # Packages for importing data <table> <tr> <td><img src="img/01-class/02/readr.png" alt="readr" title="readr" width="150px"></td> <td>Work with plain text data</td> <td><code class="remark-inline-code">my_data <- read_csv("file.csv")</code></td> </tr> <tr> <td><img src="img/01-class/02/readxl.png" alt="readxl" title="readxl" width="150px"></td> <td>Work with Excel files</td> <td><code class="remark-inline-code">my_data <- read_excel("file.xlsx")</code></td> </tr> <tr> <td><img src="img/01-class/02/haven.png" alt="haven" title="haven" width="150px"></td> <td>Work with Stata, SPSS, and SAS data</td> <td><code class="remark-inline-code">my_data <- read_stata("file.dta")</code></td> </tr> </table> --- class: title title-6 # Other types of data <table> <tr> <th>Package</th> <th>Type of data</th> </tr> <tr> <td>jsonlite</td> <td>JSON data</td> </tr> <tr> <td>xml2</td> <td>XML data</td> </tr> <tr> <td>httr</td> <td>Web APIs</td> </tr> <tr> <td>rvest</td> <td>Web pages (web scraping)</td> </tr> <tr> <td>DBI</td> <td>Databases (SQL)</td> </tr> </table> --- class: title title-6 # Next up .box-inv-6.medium[Data visualization]