Naive Bayes spam filtering using word-position-based attributes and length-sensitive classification thresholds Johan Hovold author 2006-05 text Proceedings of the 15th Nordic Conference of Computational Linguistics (NODALIDA 2005) Stefan Werner editor University of Joensuu, Finland Joensuu, Finland conference publication hovold-2006-naive https://aclanthology.org/W05-1712/ 2006-05 78 87