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Non-parametric test was conducted for a ranked variable such as the frequency of bronchodilator used during asthma attack.
These were expressed as a ranked categorical variable.
The Spearman correlation coefficient is defined as the Pearson correlation coefficient between the ranked variables.
The three items pertaining to knowledge about suicide were treated as ranked variables (ranging from 1 to 5); comparisons of results for these three items between different groups of subjects and correlation of the item scores with other continuous variables used rank tests (Mann–Whitney U, the Kruskal-Wallis test, and Spearman correlation coefficients).
We then compared the subset of best performing variables from the threshold plot, with the least relevant ranked variables by wKIERA, as well as with the complete set of original variables and with those rated as relevant according to rank correlation coefficients (Figs. 2, 3 and 4 middle).
We developed an algorithm for input selection of subsets of variables (INSEL) which uses simulated annealing (SA), LDA as well as LOOCV, and produces a ranked list of variables (genes) with high discriminative power.
Our results indicate downward as well as upward impacts of applying a grouped rank variable as compared to a continuous variable.
Poisson regression models were then used with incidence rates in each SES category as the outcome variable and the ranked SES variable as the explanatory variable.
Hence, education as rank variable might be preferable in analyses of utilization patterns.
Table 5 mirrors Table 4, just with the nine categories educational level used as rank variable instead of income.
GENIE3 [ 28] employs Random Forest algorithm to score important transcription factors, utilizing the embedded relative importance measure of input variables as a ranking criterion.
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