PRECISON CONSTRUCTION SRVS INC
information retrieval · object detection and classification (machine learning) · precision and recall are performance metrics that apply to data retrieved from a collection · retrieved   · relevant   · the program identifies eight dogs. Of the eight elements identified as dogs · only five actually are dogs ( true positives ) · while the other three are cats ( false positives ). Seven dogs were missed ( false negatives ) · where in this case · the null hypothesis is that a given item is irrelevant (not a dog) · recall is simply the complement of the type II error rate (i.e. · one minus the type II error rate). Precision is related to the type I error rate · but in a slightly more complicated way · 5 = 3 type I errors (false positives) out of 10 total cats (true negatives) · for a type I error rate of 3/10 · and 12 − · 5 = 7 type II errors (false negatives) · for a type II error rate of 7/12. Precision can be seen as a measure of quality · but misidentified 3 cats as being dogs. In a classification task · it is possible to have perfect recall by simply retrieving every single item. Likewise
Vancouver, WA 98661
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