Fig. 3From: External validation: a simulation study to compare cross-validation versus holdout or external testing to assess the performance of clinical prediction models using PET data from DLBCL patientsAUCs of 25 repeats of external simulated datasets varying the positivity rate in blue with the simulated true expected AUC in black A positivity rate of 0.10, B positivity rate of 0.66, C positivity rate of 0.90Back to article page