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1/n: On the occasion of current discussions on testing strategies in #COVID19 let's make a short tweetorial on medical decision making (a branch of biomedical cybernetics, which is underestimated but has enormous impact). #cybernetics #biocybernetics #DecisionTheory
2/n: #Sensitivity, also known as "true positive rate" (TPR) is the fraction of the number of diseased subjects with positive test divided by all diseased patients. Since in both numerator and denominator are pure counts it is independent of the prevalence of the disease: 
3/n: Likewise, the true-negative rate (TNR), the ratio of true negatives to the sum of false positives and true negatives, is independent of the prevalence:
