Precision
Also: measurement precision, positive predictive value
In measurement it means close agreement among repeats; in classification it means the fraction of positive predictions that are correct.
Measurement precision describes dispersion under stated conditions. Classifier precision is TP/(TP+FP), depends on threshold and evaluation prevalence, and is distinct from recall.
- Formula
classifier precision = TP/(TP+FP)
Example Tight 9.50 V readings may be precise but biased; 18 true and 3 false positives give classifier precision 18/21.
Common misconception Neither extra display digits nor high classifier precision alone establishes accuracy, recall, or generalization.