Dimension-Corrected Somers’ D for the Item Analysis Settings

Confidence intervals for rank statistics: Somers’ D and extensions

Somers’ D is an asymmetric measure of association between two variables, which plays a central role as a parameter behind rank or “non–parametric” statistical methods. Given a predictor variable X and an outcome variable Y , we may estimate DY X as a measure of the effect of X on Y , or we may estimate DXY as a performance indicator of X as a predictor of Y . The somersd package allows the esti...

Interpretation of Somers’ D under four simple models

(where E[·] denotes expectation), or, equivalently, as the difference between the probability that the two X,Y –pairs are concordant and the probability that the two X,Y –pairs are discordant. A pair of X,Y –pairs is said to be concordant if the larger X–value is paired with the larger Y –value, and is said to be discordant if the larger X–value is paired with the smaller Y –value. Somers’ D of...

a time-series analysis of the demand for life insurance in iran

با توجه به تجزیه و تحلیل داده ها ما دریافتیم که سطح درامد و تعداد نمایندگیها باتقاضای بیمه عمر رابطه مستقیم دارند و نرخ بهره و بار تکفل با تقاضای بیمه عمر رابطه عکس دارند

Commercial systems: paper for Somers collection

Comparing the predictive power of survival models using Harrell’s c or Somers’ D

Medical researchers frequently make statements that one model predicts survival better than another, and are frequently challenged to provide rigorous statistical justification for these statements. Stata provides the command estat concordance to calculate the rank parameters Harrell’s c and Somers’ D as a measure of the ordinal predictive power of a model. However, no confidence limits or P–va...