Questions tagged [somers-d]

Somers' $d$ is a measure of ordinal association between ordinal or continuous variables (converted to ranks)

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How to choose rank correlation coefficient?

I want to quantify correlation between rankings. Rankings in this case have got ties. Also rankings don't rank all the same entries, the rankings might be of different sizes and rank different sets, ...
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Computing AUC (or Somers' D) for ordinal logistic regression out-of-sample (cross-validation)

I have fit a proportional odds model with an ordinal response using Harrell's rms package. Now I want to measure the quality of prediction by computing Somers' D (...
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Computing c-index for an external validation of a Cox PH model with Stata

I have developed a Cox prognostic model based and internally validated it using bootstrapping. I also evaluated its calibration using Harrell’s $c$ statistic and Somers' $D$. I have also checked ...
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Am I using Goodman-Kruskal gamma or Somers D or Kendall tau correctly and what do they mean?

I am seemingly blindly following this publication that has done work very similar to what I need to accomplish (page 18-21). My analysis is a multinomial logistic regression where I have 3 possible ...
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Comparing the predictive powers of survival models using Harrell’s C in R

My question is quite concrete. Does anybody know if the approach published in [1] to compare the performance of two models using the Harrell's C or Somers’ D is available in R? I've done a search ...
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What is a reliable way to obtain an optimism-correct AUC with confidence limits?

I have seen that Frank Harrell's rms package does not offer a CI for Somers Dxy (and subsequently the c-statistic/AUROC). I am trying to look at a method with good performance and a plan to ...