Packages and Data

library(tidyverse)
library(broom)
library(fivethirtyeight)

We will be using the candy_rankings dataset from the fivethirtyeight package.

glimpse(candy_rankings)
#> Observations: 85
#> Variables: 13
#> $ competitorname   <chr> "100 Grand", "3 Musketeers", "One dime", "One q…
#> $ chocolate        <lgl> TRUE, TRUE, FALSE, FALSE, FALSE, TRUE, TRUE, FA…
#> $ fruity           <lgl> FALSE, FALSE, FALSE, FALSE, TRUE, FALSE, FALSE,…
#> $ caramel          <lgl> TRUE, FALSE, FALSE, FALSE, FALSE, FALSE, TRUE, …
#> $ peanutyalmondy   <lgl> FALSE, FALSE, FALSE, FALSE, FALSE, TRUE, TRUE, …
#> $ nougat           <lgl> FALSE, TRUE, FALSE, FALSE, FALSE, FALSE, TRUE, …
#> $ crispedricewafer <lgl> TRUE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE,…
#> $ hard             <lgl> FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE…
#> $ bar              <lgl> TRUE, TRUE, FALSE, FALSE, FALSE, TRUE, TRUE, FA…
#> $ pluribus         <lgl> FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE…
#> $ sugarpercent     <dbl> 0.732, 0.604, 0.011, 0.011, 0.906, 0.465, 0.604…
#> $ pricepercent     <dbl> 0.860, 0.511, 0.116, 0.511, 0.511, 0.767, 0.767…
#> $ winpercent       <dbl> 66.97173, 67.60294, 32.26109, 46.11650, 52.3414…

Exercises

  1. What variables and interactions did you choose?

  2. Perform backwards selection, making sure to show each step of the
    process.

  3. Provide interpretations for the slopes of your final model.

Submission

Stage, commit and push

  1. Stage your modified files.
  2. Commit your changes with an informative message.
  3. Push your changes to your GitHub repo.
  4. Verify your files were updated on GitHub.