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Error in Formula.—In the essay titled "Bayes' Formula: Conditional Probability and Clinical Medicine," published in the December Journal (1981;135:1125-1129), the mathematical formula appearing in the first column of page 1128 is incorrect. A virgule should have appeared after the first two characters, so that the formula reads as follows: TP/(TP + FP) = (P[D] × P[pos/D])/[(P[D] × P[pos/D]) + (P[D̄] × P[pos/D̄)].
CORRECTION. Am J Dis Child. 1982;136(3):204. doi:10.1001/archpedi.1982.03970390018004
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