What is a concordance statistic?
Abstract The concordance statistic is used to measure the amount of agreement between two variables, often a risk score and time until an event in survival analysis. Surprisingly, the concordance statistic is a score statistic from a Cox model with a time varying coefficient.
What does C stand for in stats?
The concordance statistic is equal to the area under a ROC curve. The C-statistic (sometimes called the “concordance” statistic or C-index) is a measure of goodness of fit for binary outcomes in a logistic regression model.
How is the concordance index used in survival analysis?
But I think that question is not specific/concrete enough to get the answer I expected. I know that, in survival analysis, the concordance index (c-index) can be used to measure how well a ranking list is w.r.t survival times of subjects (F. E. Harrell, 1996, section 5.5).
Which is true about the index of concordance?
The index of concordance is a “global” index for validating the predictive ability of a survival model. It is the fraction of pairs in your data, where the observation with the higher survival time has the higher probability of survival predicted by your model. As far as I remember it it equivalent to a rank correlation.
How is the C-index used in survival analysis?
I know that, in survival analysis, the concordance index (c-index) can be used to measure how well a ranking list is w.r.t survival times of subjects (F. E. Harrell, 1996, section 5.5). That is, if subjects with higher survival times get higher scores from the model, the c-index of the model will be large.
How is the concordance statistic used in statistics?
The concordance statistic is used to measure the amount of agreement. between two variables, often a risk score and time until an event in survival. analysis. Surprisingly, the concordance statistic is a score statistic from. a Cox model with a time varying coecient.