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With the exception of potassium, difference thresholds were more often defined as a percentage difference, and 10% was the most common difference considered significant (Table 2).
Heterogeneous grouping algorithm with given difference threshold given a similarity matrix M = { [m.sub.ij] | 1 [less than or equal to] i, [less than or equal to] n } where n is the number of students.
One question of interest was whether the difference threshold varied as a function of symptom type (lateral asymmetry vs.