A candle-wick inspector’s false “defect” calls stop the line. The matrix is 21 true defects called defect, 7 sound wicks called defect, 2 missed defects, and 70 sound wicks called sound. What is precision, and what does it mean?
Select an answer to reveal the explanation.
Short Explanation
TP 21, FP 7. Precision is 21 / 28 times 100 percent, which is 75 percent: how sure one can be about a positive call. 91 percent is recall on this matrix, or a misread of accuracy. False alarms stop the line, so precision is the named metric.
Full Explanation
TP = 21, FP = 7, so precision = 21 / 28 × 100% = 75%. It is confidence in predicted positives. 91% is recall (21/23) or a misread of accuracy ((21+70)/100). 25% inverts the ratio. False alarms clog the line, so precision is the named metric.