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Supporting Textual Input by Using Multiple Entropy Models

Bach J.

Fundamenta Informaticae

2001

Vol. 48, nr 1

1-7

The efficiency of textual input of disabled users can be considerably improved by employing prediction methods as they are used in data compression algorithms. In this paper, the application of the PPM algorithm is described along with a technique of utilizing multiple concurrent prediction models. In a prototypical implementation - called PRIS - the method has been found to reduce the number of keystrokes necessary to enter textual data by 55 to 62 percent over common text entry. Compared with zero-order prediction as used in most textual input aids that are currently used, PRIS reduces the number of keystrokes between 12 and 24 percent.