Practice: Factors
In these exercises, you will practice operations with factors needed for implementing the analysis of variance (ANOVA) analysis or drawing a boxplot. Also, try applying the function table(X) to some factor X in your R environment – it is the function that quickly counts the number of occurrences of each element in X. These exercises do not count toward your grade. They are just for practice!
Exercises: Modifying factor order
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There are some suspiciously high numbers in
tvhours. Is the mean a good summary? -
For each factor in
gss_catidentify whether the order of the levels is arbitrary or principled. -
Why did moving "Not applicable" to the front of the levels move it to the bottom of the plot?
Exercises: Modifying factor levels
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How have the proportions of people identifying as Democrat, Republican, and Independent changed over time?
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How could you collapse
rincomeinto a small set of categories?
Source: H. Wickham and G. Grolemund, https://r4ds.had.co.nz/factors.html
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