Master's Thesis in Computer Science

Masters Thesis in Computer Science: Direkt Pro l18th January 2007Supervisors: Jonas Granfeldt and crown cultivate of South Dakota NuguesAbstractDirekt Pro l (DP) is a system for grammatical master ling. It detects, annotates and displays grammatical constructs, both correct and incorrect, in freely-written schoolhouse texts by Swedish-speaking learners of French. It flush toilet also determine the learners developmental stage, given a text with enough identifying attributes. The scope of my work is the nal step, the classi cation of the text as being typical for a indisputable stage, for which machine learning (ML) methods, more speci cally C4.5, LMT (Logistic Model Tree) and SVM (Support Vector Machine), suffer been applied. This thesis is part of a longer-term research hear, led by Jonas Granfeldt and Suzanne Schlyter at the Centre for languages and lit at Lund University. The research masterject aims at increasing our com panionship regarding how Swedish- speaking learners acquire pro ciency in written French. During a three-year period, commencing in 2005, it is being nanced by the Swedish Science Council. In my tastes with an early version (1.5.2) of the pro ling system, precision and anamnesis values of a collar classi er (basic/intermediate/native), ground on sup- port vector machines, have reached 70 83 %. The system has also been time-tested with C4.5- and logistic model tree-based classi ers, giving up similar (LMT) or slightly inferior (C4.5) results.

Direkt Pro l 2.0 gives similar implementation even for a quintary classi er, and ternary classi er precision and refund is s omewhat improved as sound (up to 88 %). The! gullible Bayes method yields a lessened further overall precision/recall increase, and is much immediate than SMO (SVM) on the experiment corpus. This project paves the way for further experiments with disceptation selection and classi er performance. Contents1Introduction12Learning a Foreign Language32.1Introduction . . . . . . . . . . If you want to wee a enough essay, order it on our website: OrderEssay.net

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