Math 300Z: In-class group activity

With respect to …

The palmerpenguins::penguins data frame records body size and shape of penguins of three different species.

1. Build a model bill_length_mm ~ bill_depth_mm with a single quantitative explanatory variable.

   • What is the effect size?
   • What are the units? Is it a rate or a difference?

2. Build a model bill_length_mm ~ species with a single categorical explanatory variable.

   • What is the effect size?
   • What are the units? Is it a rate or a difference?

3. Now a model bill_length_mm ~ flipper_length + body_mass_g. There are two variables, so there will be two effect sizes.

   • What are the effect sizes? What are their units.
   • Which of the two are rates?