Mann-Whitney test

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Mann-Whitney test

(ˈmænˈwɪtnɪ)
n
(Statistics) a statistical test of the difference between the distributions of data collected in two experimental conditions applied to unmatched groups of subjects but comparing the distributions of the ranks of the scores. Also called: Wilcoxon Mann-Whitney test
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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According to the literature, this may be associated with allergic factors and genetic factors.18-20 Through completely randomly designed rank sum test for pair-wise comparative analysis, the results showed that serum levels of IL-4, IL-5, IL-10, sICAM-1, sVCAM-1, and sE-selectin 6 in the allergic rhinitis group, the asthmatic group, and the combined group were higher than those of the control group, and the results of the combined group were higher than those of the asthma group.
The results of the EQ5D were confirmed in a Wilcoxon rank sum test, with improvements in the pain/discomfort and anxiety/depression domains (z sores, −2.6 and −6.71, respectively).
Rank sum test was used to compare the BUT, SIT and FL results, because they are not conforming to the Gaussian distribution and homogeneity of variance.17 As the IC grading data is ranked data and does not conform to the Gaussian distribution and homogeneity of variance, we used rank sum test of the ranked data to compare.
For the significant predictors of functional outcome by multivariate GEE analysis, the optimal cutoff was chosen as the point with the most significant Wilcoxon rank sum test p value for all possible cutoff points.
The results of Wilcoxon's rank sum test between LebTLBO and other TLBO algorithms are presented in the last five rows of Table 2.
The Wilcoxon rank sum test acts as an alternative to Student's t-test [4], which are methods used for computing probabilities (p values) and performing hypothesis testing, not for assessing effect size or group-wise differences between two distributions of measured values.
Comparisons between the [alpha]1-ARA and control groups regarding dilated pupil diameters and PL ratios were performed by the Wilcoxon rank sum test. A Fisher exact test for 2 x 2 contingency tables was used to compare dilated pupil diameters and PL ratios by the presence or absence of general conditions (diabetes mellitus and hypertension) between the groups.
The Mann-Whitney rank sum test was used to compare absolute cell counts while chi-square or Fisher's exact test (2-tailed) was performed to compare proportions.
T -test, Fisher's exact test, and rank sum test were compared of quantitative variables.
Because heteroscedasticity was detected with the Levene's test, the nonparametric Mann-Whitney rank sum test (U) was used to compare the overall means of snail shell height, snail mass, and survival 70 d after hatch between annual and perennial treatments.
The median E% of plasma DNA of the AA group was 12.4% (interquartile interval: 7.5-13.7%), which was significantly lower than that of the healthy controls (P < 0.0001, Mann-Whitney rank sum test; Fig.
Se realizo una prueba no parametrica Mann-Whitney Rank Sum Test para probar posibles diferencias significativas entre los rangos basados en la mediana de los dos grupos (colaboracion vs no colaboracion) y el impacto normalizado de los articulos chilenos sobre direccion, ya que la variable dependiente no posee una distribucion normal (K-S Dist.= 0,300; p<0,001) asi como las varianzas no son homogeneas (Levene= 6,51; p= 0,01).