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Different methods to extract the polarized parton densities from the worldpolarized DIS data are considered. The higher twist corrections $h^N(x)/Q^2$ tothe spin dependent proton and neutron $g_1$ structure functions are found to benon-negligible and important in the QCD analysis of the present experimentaldata. Their role in determining the polarized parton densities in the frameworkof the different approaches is discussed.Comment: To appear in the Proceedings of the Spin2004 Symposium, Trieste,  11-16 Oct 200

THE ROLE OF HIGHER TWIST IN DETERMINING POLARIZED PARTON DENSITIES FROM DIS DATA