Specialized on Data processing, Data management Implementation plan, Data Collection tools - electronic and paper base, Data cleaning specifications, Data extraction, Data transformation, Data load, Analytical Datasets, and Data analysis. BJ Data Tech Solutions teaches on design and developing Electronic Data Collection Tools using CSPro, and STATA commands for data manipulation. Setting up Data Management systems using modern data technologies such as Relational Databases, C#, PHP and Android.
Friday, December 4, 2020
How to use estat concordance in a validation sample
Hi, I am trying to internally validate the Cox proportional hazard model. I have split data (70% on which I have constructed the model and 30% on which I am trying to validate it). As for CPH model, we use Harrell's C (calculated using estat concordance) and it only runs on the data on which the model was constructed (70%) not on the data (30%) I am trying to validate. Is there any way I can use estat concordance in my validation sample to see how the model is performing? Any help will be appreciated. Thanks, Zia
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