Abstract
This paper extends the Wilcoxon signed-rank test to the case where the available observations are imprecise quantities, rather than crisp. To do this, the associated test statistic is extended, using the α-cuts approach. In addition, the concept of critical value is generalized to the case when the significance level is given by a fuzzy number. Finally, to accept or reject the null hypothesis of interest, a preference degree between two fuzzy sets is employed for comparing the observed fuzzy test statistic and fuzzy critical value.
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Taheri, S.M., Hesamian, G. A generalization of the Wilcoxon signed-rank test and its applications. Stat Papers 54, 457–470 (2013). https://doi.org/10.1007/s00362-012-0443-4
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DOI: https://doi.org/10.1007/s00362-012-0443-4