It was found that 85% of all possible comparisons between pairs of observations were robust to these 98 variants. When the alternatives were restricted to a narrower range of three k values, 20%, 30% and 40%, the proportion of robust pairs of combinations rose to 91 %. » It was found that 84% of all possible comparisons between pairs of observations were robust to these 196 variants. When the alternatives were restricted to a narrower range of three k values, 20%, 30% and 40%, the proportion of robust pairs of combinations rose to 90%. It was found that 81 % of all possible pairs of comparisons were robust. When the alternatives were restricted to a narrower range of three k values, 20%, 30% and 40%, the proportion of robust pairs of combinations rose to 88%.