Joshua Goodman, Gina Venolia, Keith Steury, and Chauncey Parker
Language models predict the probability of letter sequences. Soft keyboards are images of keyboards on a touch screen for input on Personal Digital Assistants. When a soft keyboard user hits a key near the boundary of a key position, the language model and key press model are combined to select the most probable key sequence. This leads to an overall error rate reduction by a factor of 1.67 to 1.87. An extended version of this paper  is available.
In IUI '02: Proceedings of the 7th International Conference on Intelligent User Interfaces
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Gina D. Venolia, Joshua Goodman, Keith Steury, and Chauncey Parker. Language Modeling for Soft Keyboards, November 2001.
Joshua Goodman, Gina Venolia, Keith Steury, and Chauncey Parker. Language modeling for soft keyboards, American Association for Artificial Intelligence, 2002.
Joshua Goodman, Gina Venolia, Keith Steury, and Chauncey Parker. Language modeling for soft keyboards, ACM, 2002.