M. Koivisto (Finland)
HCI in Mobile, Ubiquitous and Pervasive Computing Contexts, Mobile Text Entry
In recent years, mobile text entry has been a flourishing research area. Typically text entry studies have been carried out in a laboratory environment where precise measurement methods and established accuracy and efficiency metrics can be applied. Laboratory settings provide a high level of control but they have one serious limitation – the lack of realism. Field studies, on the other hand, provide a more realistic research environment. Unfortunately however, the established methods and metrics cannot be applied in them. In this paper the metrics used in laboratory based text entry studies are analysed and new accuracy metrics for field based evaluations are developed. These two new metrics Correction Rate (CR) and subjective MSD can be used to measure corrected and uncorrected errors in free text strings typical of field tests.
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