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Mathematical re-expression, often nonlinear, of data values. Data are often transformed either to meet the assumptions of a statistical model or to make the results of an analysis more interpretable.

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I had assumed that this was because the field type often used to store gender is a bit field, and bit fields in SQL can only have the values 0 or 1. When you dump out the data, it comes out as 0 or 1, …
answered Oct 8 '11 by mauvedeity