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o visualize comparisons between two numbers—whether dealing with means, frequencies, medians, or any other data.

Side-by-side, or clustered, column and bar charts are probably the most popular options here, but their interpretive ability is limited to just comparing two things

Slopegraphs are an excellent alternative to the clustered bar chart, though they also only compare two numbers. Their strength is in showing when one category has decreased while others have increased, or when one category has increased at a rate faster than the others

—dot plots—plunks dots on a line, the easiest visualization for humans to interpret with accuracy. Depending on the data set, you can fit multiple comparisons on each line

The dumbbell dot plot, cousin to the dot plot, draws a line between two dots, emphasizing the story of the growth or gap between the two comparison points.

Back-to-back graphs, also known as population pyramids, are best at showing and comparing the overall shape of two data sets rather than comparing individual points within the data sets.

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HOW CAN I VISUALIZE HOW TWO OR MORE NUMBERS ARE ALIKE OR DIFFERENT?