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I saw different ways to calculate sensitivity coefficients in RiskyProject. What is a contribution to variance?

RiskyProject uses two algorithms to calculate sensitivity calculation: rank order correlation coefficient and contribution to variance. You can select either way to perform calculation. In most cases we use Spearman's rank correlation coefficient .
1. Spearman's rank correlation coefficient is a non-parametric measure of statistical dependence between two variables. Perfect positive correlation coefficient equals +1.
2. Contribution to Variance is calculated by squaring the rank correlation coefficients and normalizing them to 100%.

To select the sensitivity calculation method:
1.Click the Analysis tab on the Workflow bar and then click Sensitivity Analysis.
2.Click Sensitivity Calculation Algorithm.The Sensitivity Calculation dialog box opens.
3.Select the calculation method.