Dear Experts, I would appreciate your advice on calculating the power / sample size for an analysis of a ROC curve. Assuming a prevalence of 6% positive screens on the gold standard clinical interview among eligible subjects, I am not really interested in detecting difference from chance (AUC=0.50) but rather superiority to a particular value (e.g, AUC=0.70) and have a basic power to detect that particular value (e.g. power= 0.70, or higher ). I expect the AUC for my test to be observed as high as ~0.90. Much appreciated. Ping
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