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Charts of correlation
Show the relationship between two or more variables. Be mindful that, unless you tell them otherwise, many readers will assume the relationships you show them to be causal (i.e., one causes the other).
The word “correlation” is, perhaps, second only to “significance” in the pecking order of statistical terms most likely to generate a fist fight (OK, statisticians are a mostly civilised bunch, let’s just leave it at “a heated debate”).
Correlation allows us to see the extent to which two things are related. This is useful. For example, if we know something is usually high in value when another thing is low (a “negative ...
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