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Table 1 Summary measures of the difference in generating coefficients values across all simulated populations

From: Clinical prediction in defined populations: a simulation study investigating when and how to aggregate existing models

 

σ

LES, ESII, STS, German AV

LES, ESII

0

0.125

0.25

0.375

0.5

0.75

1

Lower Quartilea

0

0.29

0.58

0.86

1.16

1.74

2.31

0.37

0.14

Mediana

0

0.31

0.63

0.95

1.27

1.90

2.52

0.57

0.31

Meana

0

0.32

0.63

0.95

1.27

1.90

2.53

0.70

0.37

Upper Quartilea

0

0.34

0.68

1.03

1.38

2.06

2.74

0.85

0.54

SDb

0

0.12

0.24

0.36

0.48

0.71

0.95

0.33

0.26

  1. The values for the LES, ESII, STS and German AV are approximate, since variable definitions vary between CPMs
  2. a: values represent summary measures across all iterations of the average difference between the largest coefficient and smallest coefficient across populations b: the average standard deviation (SD) of each coefficient across all populations. All values aim to guide the between-population heterogeneity induced through different σ values