To analyze the correlations among all pairs of the five typical learning environments, and their sub-level indicators, correlations coefficients were calculated using the nonparametric Spearman rho statistic, and a significance level of P < 0.05 (2-tailed) was applied.
From among the available county indicators correlation coefficients imply statistically significant associations of the county specific nursing densities with health spending per capita and immunization rates.
Three indicators, specifically TP, LDL, and Ca, were screened out, as they demonstrated the highest correlations with the other two indicators (correlation coefficients: TP/ALB = 0.936, LDL/CH = 0.968 and Ca/ALB = 0.813).
This approach is akin to a distance metric (see Methods), and in fact the matrix of indicator vector correlations can be used to generate an NJ tree (Figure 6).
Correlation ratio is an indicator for correlation of gene expression with two classes.
In the latter case, for valid indicators the correlations should remain at a low level (divergent validity), whereas in the former case they should be at a high level (convergent validity).
For interpretation purposes, the most significant indicators (with correlations over 0.5 and less than −0.5) were assumed as drivers of each component and provided the rationale for the naming conventions and corresponding cardinality according to their influence on social vulnerability.
We report the median value of the indicator-attribute correlations, along with their 95% confidence intervals.
For the individual indicators, intraclass correlations (ICC) ranged from approximately 0.03 (Safety) to 0.40 (Housing and privacy) (data not shown).
In the second scenario, we considered indicators with correlations more than 0.2, significance level of less than 0.05, and missing data less than 20%.
