  We determine the strong coupling alpha_s(M_Z) from scaling violations of
truncated moments of the nonsinglet deep inelastic structure function F_2.
Truncated moments are determined from BCDMS and NMC data using a neural network
parametrization which retains the full experimental information on errors and
correlations. Our method minimizes all sources of theoretical uncertainty and
bias which characterize extractions of alpha_s from scaling violations. We
obtain alpha_s(M_Z) = 0.124 +0.004-0.007 (exp.) + 0.003- 0.004 (th.).
