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We extract polarized parton distribution functions (PPDFs), referred to as"KTA17," together with the highly correlated strong coupling $\alpha_s$ fromrecent and up-to-date $g_1$ and $g_2$ polarized structure functions world dataat next-to-next-to-leading order in perturbative QCD. The stability andreliability of the results are ensured by including nonperturbative target masscorrections as well as higher-twist terms which are particularly important atthe large-$x$ region at low Q$^2$. Their role in extracting the PPDFs in thenucleon is studied. Sum rules are discussed and compared with other resultsfrom the literature. This analysis is made by means of the Jacobi polynomialsexpansion technique to the DGLAP evolution. The uncertainties on theobservables and on the PPDFs throughout this paper are computed using standardHessian error propagation which served to provide a more realistic estimate ofthe PPDFs uncertainties.

Nucleon spin structure functions at NNLO in the presence of target mass corrections and higher twist effects