Plotting results

The chart is an argument

The chart type follows the question. Comparing categories is a bar chart, showing change over time is a line, and showing a relationship between two measures is a scatter. A pie chart answers almost nothing.

Unlabelled axes are the most common flaw in analysis output. A reader who cannot tell whether the y axis is counts or percentages cannot evaluate your conclusion.

Save figures at an explicit size and resolution. A chart that looks fine in a notebook is frequently unreadable when pasted into a document.