# Rank Correlation

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## Rank Correlation

In statistics, the extent to which two rankings match each other. There are various systems to calculate rank correlation. However, rank correlation is expressed on a scale from -1 to +1. A measure of -1 indicates the rankings disagree perfectly (meaning they are opposite one another), while a measure of +1 means they agree perfectly (meaning they are the same). A measure of 0 means the rankings are independent of one another.
References in periodicals archive ?
In this analysis, Spearman's rank correlation coefficient (rs) which is an index of correlation obtained from rank data is calculated.
Spearman rank correlation analysis demonstrated that the expression of miR203 was negatively correlated with CD147 and D-dimer in patients with gastric cancer (p<0.05), with the expression of miR203 increased, the expression of CD147 and D-dimer decreased.
By using Pearson's rank correlation coefficient, a potent correlation was seen with TAC level (r=-0.618, P<0.05), but there was a low correlation with GSH level (r=-0.69, P<0.001).
The relationship between year and the proportion of candies above the lead content standard (Figure 1), as evaluated by Spearman's rank correlation coefficient, was negative (r = -.81) and significant (p < .01).
Finally, the monotonic relationship of the variables (whether linear or not) was assessed and found to be statistically significant for the percentage of PD-1 in TILs with PD-L1 in TCs (Spearman rank correlation factor = 0.29, P < .001), and PD-1 in TILs with PD-L1 in ICs (Spearman rank correlation factor = 0.31, P < .001).
 Abdi, H., "The Kendall rank correlation coefficient," Encyclopedia of Measurement and Statistics.
of lessons) .544 .0028 .620 Improved freestyle .008; (**) -.324; .084; (sec) .9216 .0028 .8011 Note: DM--Dentistry Medicine, GM--General Medicine, reps no - number of reps, Abd--abdomen, Legs--Lower limbs, pt.-points; Nonparametric Correlation Spearman Rank Correlation; (**) (P<0.01) (two-sided) ; P - Two-sided Probability Table 2.
Ranking orders, Spearman's rank correlation, and significance test of the electrical resistivity and moisture content of soil ERT Borehole Depth (m) Resistivity Rank profile (Ohm.m) 2 30 12 7 28 8 9.5 27 7 P1 BH1 11 23 4.5 12 23 4.5 14 30 12 15 29 9.5 3 22 2 P2 BH5 4.5 22 2 7 22 2 22 148 15 4 29 9.5 P2 BH7 6 25 6 8 30 12 20 53 14 [r.sub.s] -0.6030 t statistic -2.66 P (Significance) 0.019 ERT Borehole [omega] (%) Rank profile 16 6.5 15.8 5 16.4 8 P1 BH1 21.7 13.5 21.7 13.5 20.5 12 16.6 9 15 3 P2 BH5 25.3 15 19.2 11 9.2 1 16 6.5 P2 BH7 17 10 15.5 4 10 2 [r.sub.s] t statistic P (Significance) Table 2.
The relationship between staining intensity and clinicopathological patterns was evaluated using Spearman rank correlation or [chi square] test.
Spearman's rank correlation test was performed to highlight relationship between incidence, severity, and aflatoxin concentration levels using correlation test function of package stats.
Spearman rank correlation analysis performed on data collected from CHC patients (Table 2) indicated strong reverse correlation for miR-122 expression between liver and PBMCs as well as for LPL expression between these two origins.
In order to solve the problem of poor classification performance in tumor classification, a novel feature genes selection method, called supervised locally linear embedding and Spearman's rank correlation coefficient ([SLLE-SC.sup.2]), is put forward in this paper.
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