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Table 2 Characteristics of the update methods and number of parameters estimated in the case study of prediction of prostate cancer at biopsy

From: Improving prediction models with new markers: a comparison of updating strategies

Method Data required Nr. Parameters estimated Nr. Parameters estimated in case study
Original Model No data 0 0
Model Revision with extension Marker set p + m + 1 5
Model Revision with shrinkage Marker set p + m + 1 5
Recalibration and extension Marker set m + 2 3
CLR Marker set 2 m (p + 1) + m (m + 1) 10
CLR simple Marker set m (p + 2) + m (m + 1)/2 6
Imputation Development and marker p + m + 1 5
  1. p: number of predictors in original model, m: number of markers