As far as I know, the concordance index for survival analysis is designed to run only on the predicted risk, which is the default output of the coxph function. For example, the documentation on concordance.index function in the survcomp package says that the input x must be a predicted risk.

for potentially high-dimensional survival data based on boosting a smooth version of the concordance index. (C-index). Due to this objective function, the  28 Sep 2018 4.5 C-index, hazard ratio and log-rank χ2-statistic for the three final ran- dom survival forests (RSF) models and the Cox proportional hazards. models. Performance of the survival models was assessed by ROC AUCs and weighted c-indices. ROC AUC to 92.3% (p 0.008) and c-index to 0.854. p-value . optimized deep survival models and other state of the art machine learning calculated using Harrell's c-index, a non-parametric statistic that measures  Before calculating the C-index or using the rcorrp.cens function, TNM staging system First, an intercept only Cox regression model is fit to the survival times to  survival than patients with a prognostic index higher than the median; and (iii) predicted survival larger than the observed censoring time, with γ∗ c < γc. Ad-.

Before calculating the C-index or using the rcorrp.cens function, TNM staging system First, an intercept only Cox regression model is fit to the survival times to 

a new recurrent neural network model for personalized survival analysis called rnn-surv two loss functions, our model gets better concordance index (C-index) . 15 Dec 2011 The survival data are usually stored in a Surv object that is a one-column print( perf[1:5]). $c.index. [1] 0.5596659. $se. [1] 0.04160814. 10  9 Dec 2010 ology for estimating the C index suitable for survival analysis where example a Cox regression model and a random survival forest model. 13 Jan 2013 (survAUC::BeggC); C-statistic by Uno et al. (survC1::Inf.Cval; survAUC::UnoC); Gonen and Heller Concordance Index for Cox models  17 Nov 2014 right-censored survival time, the C index, motivated as an extension of area under the receiver operating characteristic curve, has been  The concordance index or C-index is a generalization of the area under the ROC curve (AUC) that can take into account censored data. It represents the global assessment of the model discrimination power: this is the model’s ability to correctly provide a reliable ranking of the survival times based on the individual risk scores. In survival analysis, a pair of patients is called concordant if the risk of the event predicted by a model is lower for the patient who experiences the event at a later timepoint. The concordance probability (C-index) is the frequency of concordant pairs among all pairs of subjects.

28 Sep 2018 4.5 C-index, hazard ratio and log-rank χ2-statistic for the three final ran- dom survival forests (RSF) models and the Cox proportional hazards.

index of 1.0). Throughout this paper, we use the c-index to evaluate the accuracy of our predictions. II. METHODS OF SURVIVAL ANALYSIS. A. Cox Model.

R - differences between cindex function from pec package and coxph. Ask Question I'm comparing the cindex function from the pec package with the resulting concordance index from coxph (survival package). 1) First the results between these two functions are different.

survival than patients with a prognostic index higher than the median; and (iii) predicted survival larger than the observed censoring time, with γ∗ c < γc. Ad-. lower prognostic index are allocated to higher risk groups. The second 1,,nt. ˆC is the Kaplan-Meier estimate of the censoring distribution, and ˆC(y− i ) is the. The C-index, C, is defined by C = Concordance/Permissible. Page 7. RANDOM SURVIVAL FORESTS 847. 5.2. OOB prediction error. Calculating C requires. #Examples of neural network survival model with simulated data. #Meant to be run interactively. print('Harrell C-index for: '+breaks_description_list[breaks_i]).

29 Dec 2016 Keywords: Biomarkers, C-index, discrimination, Pareto model, After determining if predictors of censored survival data are significant, 

17 Nov 2014 right-censored survival time, the C index, motivated as an extension of area under the receiver operating characteristic curve, has been  The concordance index or C-index is a generalization of the area under the ROC curve (AUC) that can take into account censored data. It represents the global assessment of the model discrimination power: this is the model’s ability to correctly provide a reliable ranking of the survival times based on the individual risk scores. In survival analysis, a pair of patients is called concordant if the risk of the event predicted by a model is lower for the patient who experiences the event at a later timepoint. The concordance probability (C-index) is the frequency of concordant pairs among all pairs of subjects.

models. Performance of the survival models was assessed by ROC AUCs and weighted c-indices. ROC AUC to 92.3% (p 0.008) and c-index to 0.854. p-value . optimized deep survival models and other state of the art machine learning calculated using Harrell's c-index, a non-parametric statistic that measures  Before calculating the C-index or using the rcorrp.cens function, TNM staging system First, an intercept only Cox regression model is fit to the survival times to  survival than patients with a prognostic index higher than the median; and (iii) predicted survival larger than the observed censoring time, with γ∗ c < γc. Ad-. lower prognostic index are allocated to higher risk groups. The second 1,,nt. ˆC is the Kaplan-Meier estimate of the censoring distribution, and ˆC(y− i ) is the.