Jackknife resampling technique on mocks: an alternative method for   covariance matrix estimation
  We present a fast and robust alternative method to compute covariance matrix in case of cosmology studies. Our method is based on the jackknife resampling applied on simulation mock catalogues. Using a set of 600 BOSS DR11 mock catalogues as a reference, we find that the jackknife technique gives a similar galaxy clustering covariance matrix estimate by requiring a smaller number of mocks. A comparison of convergence rates show that $\sim$7 times fewer simulations are needed to get a similar accuracy on variance. We expect this technique to be applied in any analysis where the number of available N-body simulations is low. 
S. Escoffier, M.-C. Cousinou, A. Tilquin, A. Pisani, A. Aguichine, S.   de la Torre, A. Ealet, W. Gillard, E. Jullo
astro-ph.CO