In Taguchi Method, why the degree of freedom for a factor is given by formula (level-1)?

07 July 2018 1 866 Report

I cannot understand why 1 is subtracted from the level to find out the degree of freedom?

assume there is a single factor with one level then the DOF will be zero (there is no meaning of the experiment as there is no independent comparison could be made in the data), consequently if you increase the number of levels by one (two levels) you will gain one DOF and so on. 1 DOF allows a single independent comparison to be made in the data.

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