How To Title A Chart
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Start with a simple 2x2 table, percentaged in the right direction. The INDEPENDENT variable is across the top and the DEPENDENT variable is on the side. We percentage down — within categories of the independent variable. Then we can compare across: "half of the boys have only a high school education compared to 30% of the girls."

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How do we name this table? The convention will be "Dependent Variable by Independent Variable" so here that would be "Education by Sex."

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What chart do we make to visualize this table? In fact, it's really too simple to need to be shown in a chart, but for the sake of illustration we continue. The relevant comparisons here are boys to girls. Two possible charts come to mind:

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Visually, proximity determines what comparison we do first. Since the first comparison in the 2x2 table is "50% of boys have HS compared to 30% of girls have HS," the chart on the left is the correct one here.

Let's look at it's components

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needs more by way of summary and consideration of how this generalizes to other charts