Asian Journal of Information Management1819-334x2152-3479Academic Journals Inc.10.3923/ajim.2008.14.22HadiWa`el Musa ThabtahFadi MousaSalahideen HawariSamer Al KanaanGhassan AbabnihJafar 1200821On 20 text categorization data sets, the research investigated different variations of VSM using KNN algorithm and different term weighting approaches compared in term of F1 measure. The experimental results provide evidence that Dice and Jaccard Coefficient outperformed the Cosine Coefficient approach with regards to F1 results and the Dice-based TF. IDF achieved the highest average scores.]]>Debole, F. and F. Sebastiani,20032003pp: 784788Deng, Z.H., S.W. Tang, D.Q. Yang, M. Zhang, L.Y. Li and K.Q. Xie,20043007588597Hadi, W., F. Thabtah and H. Abdeljaber,20072007pp: 296300Joachims, T.,19981998pp: 137142Lan, M., S.Y. Sung, H.B. Low and C.L. Tan,20052005pp: 10321033Lan, M., C.L. Tan and H.B. Low,20062006Leopold, E. and J. Kindermann,200246423444Moulinier, I., G. Raskinis and J. Ganascia,19961996Quinlan, R.,19931993Salton, G. and M.J. McGill, 1983Pages: 448Pages: 448Salton, G.,19881988pp: 450pp: 450Sebastiani, F.,19991999Sebastiani, F.,20052005pp: 109-129pp: 109-129Jones, K.S.,1972281121Thabtah, F., P. Cowling and Y. Peng,20042004pp: 217224Tokunaga, T. and M. Iwayama,19941994Tzeras, K. and S. Hartman,19931993pp: 2235Van Rijsbergan, C.,19792nd Edn.,Pages: 224Pages: 224Wiener, E., J.O. Pedersen and A.S. Weigend,19951995pp: 317332Yang, Y. and C.G. Chute,199412252277Yang, Y.,199916990Yang, Y. and X. Liu,19991999pp: 4249