Logistic regression prediction

As with linear regression, the joy of logistic regression is that you can make predictions. Let's step through the prediction flow one more time!

churn and mdl_churn_vs_both_inter are available; dplyr, tidyr and ggplot2 are loaded.

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Create a grid of explanatory variables.

Set time_since_first_purchase to a sequence from minus two to four in steps of 0.1.
Set time_since_last_purchase to a sequence from minus one to six in steps of 0.1.