Question

What are some of the advantages of using the F measure (weighted harmonic mean) over using the Precision & Recall when evaluating an IR system performance? (list at least two advantages)

Answer 1

Answer and Explanation:

Some of the advantages of using the F measure (weighted harmonic mean) over using the Precision & Recall when evaluating an IR system performance are as follows-

• Precision quantifies the number of positive class predictions that actually belong to the positive class.

• Recall quantifies the number of positive class predictions made out of all positive examples in the dataset.

• F-Measure provides a single score that balances both the concerns of precision and recall in one number.

• A measure that combines precision and recall is the harmonic mean of precision and recall, the traditional F-measure or balanced F-score:

F=2((precision.recall)/(precision+recall))