  Recently the Lattice Strong Dynamics Collaboration reported a reduction of
the electroweak S parameter for SU(3) gauge theory with Nf=6 fermions in the
fundamental representation, compared to scaled-up QCD (arXiv:1009.5967). Here I
provide additional details of our calculation. I discuss our use of conserved
lattice currents; the relation to vector--axial parity doubling; finite-volume
effects; and the sensitivity of our results to the number of fermion doublets
with chiral electroweak couplings. Results presented here include additional
data, and do not affect our previously-published conclusions.
