Logarithmic (Percentage) Scaling: On a logarithmic scale chart, the vertical spacing between two points corresponds to the percentage change between those numbers. Thus, on a log scale chart, the vertical distance between 10 and 20 (a 100% increase) is the same as the vertical distance between 50 and 100. Because these charts show percentage relationships, logarithmic scaling is also called "percentage" scaling. It is also called "semi-log" scaling because only one of the axes (the vertical one) is scaled logarithmically.
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