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Evaluation of a Stylometry System on Various Length Portions of Books

The Pace University Stylometry Biometric System was developed as an extension of a previously developed keystroke biometric system. Earlier experiments on short texts taken from online test-takers gave poor results on the Pace system. This study tests the system on text input ranging from 250 to 10,000 words to obtain the accuracy as a function of text length. 10 samples each from 30 authors were collected for a total of 300 texts, all published between 1880 and 1930. The results show that performance as measured by the Equal Error Rate generally improves with increased text length, and that the best results are achieved with fewer subjects and “strong” training.