C-index not good for predictivity

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Abhaya Indrayan

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Jun 10, 2024, 10:33:57 AM6/10/24

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We have tried to show in the attached paper https://pubmed.ncbi.nlm.nih.gov/38668827/ that the area under the ROC curve (C-index) is good for assessing discrimination and classification of the KNOWN outcomes but is not adequate for assessing the performance for prediction of the UNKNOWN outcomes. It is erroneously used for assessing the performance of a prediction model. We have also proposed that for predictivity the best cutoff is not the Youden index but is the P-index where the (PPV + NPV) is maximum.

We would appreciate any feedback. Thanks.

~Abhaya Indrayan

Dr Abhaya Indrayan, MSc,MS,PhD(OhioState),FSMS,FAMS,FRSS,FASc

Personal website: http://indrayan.weebly.com

JPGMpredictiveROC2024.pdf

Manoj Diwakar

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Jul 30, 2024, 10:44:50 AM7/30/24

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Congratulations sir and will go to this manuscript

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Best Regards,

Dr. Manoj Kumar Diwakar, M.Sc., M.Phil.,Ph.D. (Statistics)
Assistant Professor
Centre for Economic Studies & Planning (CESP), School of Social Sciences (SSS-II),
Jawaharlal Nehru University, New Delhi-110067, India.

Email id: Manojdiw...@gmail.com & mobile-09990346151

Area of Specialisation: Statistics, Econometric and Applied Mathematics

Research Methodology -Quantitative Methods, Health Economics, Clinical Trial-Biostatistics