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CHI
2003
ACM

Metrics for text entry research: an evaluation of MSD and KSPC, and a new unified error metric

14 years 4 months ago
Metrics for text entry research: an evaluation of MSD and KSPC, and a new unified error metric
We describe and identify shortcomings in two statistics recently introduced to measure accuracy in text entry evaluations: the minimum string distance (MSD) error rate and keystrokes per character (KSPC). To overcome the weaknesses, a new framework for error analysis is developed and demonstrated. It combines the analysis of the presented text, input stream (keystrokes), and transcribed text. New statistics include a unified total error rate, combining two constituent error rates: the corrected error rate (errors committed but corrected) and the not corrected error rate (errors left in the transcribed text). The framework includes other measures including error correction efficiency, participant conscientiousness, utilised bandwidth, and wasted bandwidth. A text entry study demonstrating the new methodology is described.
R. William Soukoreff, I. Scott MacKenzie
Added 01 Dec 2009
Updated 01 Dec 2009
Type Conference
Year 2003
Where CHI
Authors R. William Soukoreff, I. Scott MacKenzie
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