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I am trying to determine the ability of my students to touch type.

I have data on their speed (in seconds) and their accuracy (number of errors). I also know the number of words in the test (50 words).

Eg. Name: Bob, Speed: 113s, Errors: 19

Eg. Name: Jane, Speed: 831s, Errors: 65

How do I create an index value that places the students with the higher speed and the higher accuracy with the highest index value and a sliding scale for students with lower speed and lower accuracy?

The index would also reflect situations where students are slow but accurate, or fast yet inaccurate.

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When I took typing, the formula was (words per minute)-10(mistakes) for a 1-2 minute test. You can adjust the coefficient as you wish depending on whether you think speed or accuracy is more important. Presumably the errors scale with time, so the coefficient should go down as the test length increases.

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    Ah, that makes sense! Thanks for your help.2012-06-07