Two correlation/association coefficients: Pearson r_0 and Spearman r_1, are reviewed and compared.
A data frame with 19 observations on the following two variables.
Total procedure time. Minutes on a natural log scale.
Dose of CT fluoroscopy-guided procedure. Rads on a natural log scale.
Both correlation coefficients confirm that the log of total time and the log of dose are correlated strongly and positively.
Zou, K. H. and Tuncali, K. and Silverman, S. G. (2003). "Correlation and simple linear regression". Radiology, 227, 617–628.
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