Internal calculation: prediction model development (Riley 2020 BMJ method)

Binary outcome: criteria B1 (overall proportion precision), B3 (shrinkage target S), with B2 (mean absolute prediction error, van Smeden formula) reported for P <= 30. Sample size = max(B1, B3). Anchors (exact): B1 φ=0.5,δ=0.05 -> 385; B3 P=30,R2cs=0.05,S=0.9 -> 5249; B2 MAPE=0.05,φ=0.3,P=10 -> 461.

Usage

calculate_predictive_riley_binary(
  prev,
  n_parameters,
  r2_cs,
  shrinkage,
  mape,
  precision_delta,
  alpha
)