  A thorough understanding of PDFs and their uncertainties is important for the
LHC and for future collider experiments. The recently released NNPDF3.0 set was
presented alongside results from closure tests, where PDF fits were performed
on pseudo-data generated from a chosen input PDF set. The results there
demonstrate the validity of the NNPDF methodology and also provide some
information about different contributions to the PDF uncertainties. Here I
present a number of additional closure test results, specifically an
investigation into the effect of using cross-validation in the fits, and an
assessment of the successful reproduction of LHC cross-sections in closure
tests. The results are consistent with those previously shown in the NNPDF3.0
paper.
