Abstract This paper analyzes unobserved heterogeneity when observed characteristics are modeled nonlinearly. The proposed model builds on varying random coefficients (VRC) that determined by nonlinear functions of regressors and additively separable unobservables. proposes a novel estimator the VRC density based weighted sieve minimum distance. main example bases Hermite which yield numerically...

A recently developed formula for the Hall coefficient [A. Auerbach, Phys. Rev. Lett. 121, 66601 (2018)] is applied to nodal line and Weyl semimetals (including graphene), spin-orbit split semiconductor bands in two three dimensions. The calculation reduces a ratio of equilibrium susceptibilities, where corrections are negligible at weak disorder. Deviations from Drude's inverse carrier density ...