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# Measure

This option measures precision and recall between extraction runs by comparing the expected results of entity extraction with the actual results.

Expected results are created once and remain as a base reference for ongoing tests. Actual results are generated as required each time a grammar is modified. The two results are compared to generate precision and recall information.

To generate expected results, run `edktool -extract`, and then revise the generated output file so that it contains the correct matches. From then on, `edktool -extract` is used only to create the actual results, and the two files are compared against each other to generate precision and recall information on an ongoing basis.

`-e <expectedfile>` | The expected results file from `edktool -extract`.
`-a <actualfile>` | The actual results file from subsequent extraction runs with modified grammar files.
`-o <resultsfile` > | The results, including precision, recall, and differences.
`-q` | (Optional) Sets “Quiet Mode” so that descriptive messages are removed, and the output consists of only an XML document containing the differences between the expected and actual output.

For more information on how to use the Measure feature to check the effectiveness and performance of your grammar files, refer to IDOL Expert.

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