**Normalization (statistics) - Wikipedia**
https://en.wikipedia.org/wiki/Normalization_(statistics)

There are different types of normalizations in statistics – nondimensional ratios of errors, residuals, means and standard deviations, which are hence scale invariant – some of which may be summarized as follows. Note that in terms of levels of measurement, these ratios only make sense for ratio measurements (where ratios of measurements are meaningful), not interval measurements (where only distances are meaningful, but not ratios). See also Category:Statistical ratios. Note that some other ratios, such as the variance-to-mean ratio $${\textstyle \left({\f…

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