UniODA vs. Wilcoxon Rank Sum Test: A Small-Sample Paired Experiment

Paul R. Yarnold

Optimal Data Analysis, LLC

Consumer opinion of two competing brands of frozen dinners was rated by six independent purchasing managers, each using a 10-point Likert-type scale. Comparing ratings using the Wilcoxon rank sum test revealed no statistically significant difference between brands (p > 0.10). Using UniODA there was a statistically marginal (p < 0.072) relatively strong (ESS = 66.7) difference between brands in training analysis, that was stable and statistically significant (p < 0.031) in jackknife (leave-one-out) validity analysis.

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