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Five Finger Communication A mnemonic tool for recalling the essential elements of a good sending message. Each finger represents a particular part of a message. Using this tool a message can be sent with percision and boundaries.

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Precision (PPV) and recall (sensitivity). 100% sensitivity means no false negatives. 100% specificity means no false positives.

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Confusion Matrix from Wikipedia (Notes: 1. In multi-class classification, the matrix would be n by n instead of 2 by 2; 2. F measure uses both precision and recall)

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