  We have studied the spin-polarized three-dimensional homogeneous electron gas
using the diffusion quantum Monte Carlo method, with trial wave functions
including backflow and three-body correlations in the Jastrow factor, and we
have used twist averaging to reduce finite-size effects. Calculations of the
pair correlation function, including the on-top pair density, as well as the
structure factor and the total energy, are reported for systems of 118
electrons in the density range $r_\text{s}=0.5$--20 a.u., and for spin
polarizations of 0, 0.34, 0.66, and 1. We consider the spin resolution of the
pair correlation function and structure factor, and the energy of spin
polarization. We show that a control variate method can reduce the variance
when twist-averaging, and we have achieved higher accuracy and lower noise than
earlier quantum Monte Carlo studies.
