1Blurb:: Employ a hierarchical sparse grid construction 2 3Description:: 4 5Stochastic collocation with sparse grids can employ either a nodal or hierarchical 6formulation. The hierarchical formulation requires nested interpolation rules 7as it utilizes increments in collocation points along with hierarchical weights 8defined from a hierarchical basis formulation. 9 10This keyword requests the hierarchical formulation, which has benefits 11for adaptive refinement by supporting direct computation of increments 12in targeted statistics (e.g. mean, covariance, reliability indices), 13avoiding loss of precision from subtractive cancellation. 14 15Topics:: 16Examples:: 17Theory:: 18Faq:: 19See_Also:: 20