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DEGREE OF FREEDOM
That measure of variability which merely expresses the number of options available within a variable or space. In a system with N states the degree of freedom is N. In statistics of the N cells of a table of probabilities only N-1 can be arbitrarily filled, the last being determined by the requirement that probabilities must add to 1 (see probability), hence the degree or freedom is N-1. The measure of uncertainty may be interpreted as a logarithmic measure of the degree of freedom logically or statistically available. (Krippendorff)
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