The aim of the DACSEIS project is to deliver recommendations on the
use of variance estimators under complex survey designs in the
presence of non-response. Since mathematical comparisons on the
efficiency of variance ...
The spacetime mean curvature of a 2-surface in a 4-dimensional spacetime is defined as the (Lorentzian) length of the codimension-2 mean curvature vector of the surface in the ambient spacetime. In particular, we are ...