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What is R?

Document ID: DQ073
Relevant to following products: WorkOut 2.0 Manta
Document description: What is R?

R is one way of measuring the goodness of the fit.

Note, although the small 2 looks like it is the square of R it does not actually mean that.

R does not have any units and is a fraction between 0 and 1, the higher the number the better the fit. You can consider that R compares the fit with a horizontal line, if the result is 0 then the fit is no better than a horizontal line through the mean of the Y values. If R is 1 then all points lie exactly on the fit (i.e you can calculate Y exactly from the fit). Also, R may even be negative if the fit is really bad again you would not expect this for something squared.

R is calculated as: 1 minus the ratio of SS / (the sum of the squares of the differences between Y fit and the mean Y value).

Related articles:
DQ074: What is SS?
What is SS?

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