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...o measure the predictive power, is it a time-dependent value (i.e. do I need to calculate it for each time period?) or we can calculate it as a single value for the whole model ignoring the time? Thank you so much. Bessy -- View this message in context: http://n4.nabble.com/C-index-and-Cox-model-tp1774155p1774155.html Sent from the R help mailing list archive at Nabble.com.