Other Formulations of Fitts’ Law

Other Formulations of Fitts’ Law

• Welford’s

MT = a + b log2((A + 0.5W)/W)

• Shannon’s

MT = a + b log2((A + W)/W)

- Avoids negative ID’s

- Better fit for the data observed in literature

- Exactly mimics the information theory underlying Fitts’ Law

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