Plotting amounts: barcharts and dot plots

1. Using the mtcars data, create a barchart of the counts for each level of cylinder.

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2. Repeat the barchart but stack the counts by gear.

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3. Recreate this plot:

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4. Repeat barchart #2 but set the position to “dodge”.

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5. Whoa, what happened to 8 cylinders? Unfortunately, since there were only two levels of gear for 8 cylinders, it just split the bars in two. To hold the numbers of bars the same across all levels, you can set position to position_dodge(preserve = "single"). Try that.

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6. Well, that’s better—the two bars are the same width as all of the other bars. But the 4 gears should show up as 0. To fix, we need to count the data first, find implicitly missing data, and plot using geom_col(). So first, find counts for the combinations of cylinders and gears. Then use complete() to find the implicitly missing combinations. Then replace the NAs with 0s. Then use geom_col() to plot these values with the position dodged.

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7. Make a dotplot of the counts for each level of carb and plot carb on the y-axis and the count on the x-axis. Reminder that first you’ll need to count the observations in each level of carb before starting the plot.

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8. Repeat dotplot #8 but order carb based on the counts from highest to lowest count.

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