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  3. Hierarchical and Mixed Effects Models in R

Exercise

Plotting results

In the previous exercises, you have examined the raw data, used the data to build a model, and applied the model for statistical inferences. You found drug 2 increased the amount of extra sleep compared to drug 1. During this exercise, you will plot the results to see how much drug 2 increased extra sleep.

First, wrangle the data by using pivot_wider() function from the tidyr package. Then, calculate the difference in extra sleep for each individual. Last, plot this difference as a histogram.

Instructions 1/2

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  • Load the tidyr package.
  • Spread the data and save the results as sleep_wide.
  • Calculate the difference and save this as the column diff.