In this paper a non--singlet QCD analysis of the structure function F2 in LO, NLO and NNLO is performed based on the Jacobi polynomials. For parameterization we used world data for charged lepton scattering. We determine the valence quark densities in a wide range of x and Q2.
PACS numbers: 13.60.--r, 12.38.Bx
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