Exercise

Warming in Minneapolis?

The data frame HDD_Minneapolis records the temperatures in Minneapolis, Minnesota, USA, for more than 100 years. A "heating-degree day" is the number of degrees below 65 degrees Fahrenheit each day.

HDD_Minneapolis sums the heating-degree days for all the days in each month. Thus, winter months have much higher hdd than summer months.

Instructions

100 XP

Train the models provided in the editor.
Evaluate the models using the training data as input.
Calculate R-squared for each model by comparing the variance of the model output to the variance of the actual response variable. To think about: the model hdd ~ month captures the large majority of variance in the hdd variable. What common sense explanation is there for this?