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Table 3 Varied factors in the simulation study

From: A modified Wald interval for the area under the ROC curve (AUC) in diagnostic case-control studies

Factor

Variation

Results in paragraph

True AUC (AUC 0)

0.7,0.8,0.9 (each ±0.01)

 

Sample size (n)

40,100,200

 

Case-control ratio

1:1

Interval length, coverage probability

Measurement scale

Continuous

 

Variance of the cases (σ 1), σ 0 = 1

1

 

Case-control ratio

1:2, 1:9

 

Measurement scale

Ordinal with five categories

Robustness evaluation

Variance of the cases (σ 1), σ 0 = 1

0.5,2,3

 

AUC under the alternative hypothesis (AUC 1)

0.700,0.701,…,0.85;

Statistical power

 

0.800,0.801,…,0.99