14.1 Data: Palmer Penguins

There exist multiple penguin species throughout Antarctica, including the Adelie, Chinstrap, and Gentoo. When encountering one of these penguins on an Antarctic trip, we might classify its species

$$Y = \begin{cases} A & \text{Adelie} \\ C & \text{Chinstrap} \\ G & \text{Gentoo} \end{cases}$$

three species

$X_{1}$ categorical variable: whether the penguin weighs more than the average 4200 grams

$$X_{1} = \begin{cases} 1 & \text{above-average weight} \\ 0 & \text{below-average weight} \end{cases}$$

AKA culmen length and depth

numerical variables:

$$\begin{array}{rcl} X_{2} & = & \text{bill length (mm)} \\ X_{3} & = & \text{flipper length (mm)} \\ \end{array}$$

data(penguins_bayes)
penguins <- penguins_bayes

adelie_color = "#fb7504"
chinstrap_color = "#c65ccc"
gentoo_color = "#067476"

penguins %>% 
  tabyl(species)

##    species   n   percent
##     Adelie 152 0.4418605
##  Chinstrap  68 0.1976744
##     Gentoo 124 0.3604651