  We perform a detailed NLO analysis of the combined CCFR xF_3 and F_2
structure functions data and extract the value of alpha_s, parameters of
distributions and higher-twist (HT) terms using a direct solution of the DGLAP
equation. The value of alpha_s(M_Z)=0.1222\pm 0.0048 (exp) \pm 0.0026 (theor)
is obtained. Our results has a larger central value and errors than the
original one of the CCFR collaboration due to model independent
parameterization of the HT contributions. The dependence of HT contributions on
the QCD renormalization scale is studied.
