We initiate the study of asymptotic behavior small solutions to one-dimensional Klein-Gordon equations with variable coefficient quadratic nonlinearities. The main discovery in this work is a striking resonant interaction between specific spatial frequencies and temporal oscillations solutions. In case novel type modified scattering occurs that exhibits logarithmic slow-down decay rate along ce...

Economic literature has identified two potential types of racial discrimination in sports careers: exit discrimination and wage discrimination. The authors test for both types of discrimination in National Basketball Association (NBA) data in two ways. First using a modified Heckman procedure, they control for potential survival bias that may arise from exit discrimination in panel data and cou...

This paper studies the estimation oi coefficients B in single inde;-; models such that E(y I X) =F (a + X '6) 1 where the function F is misspecified or unknown. A linear instrumental variables slope coefficient vector of y regressed on X is shown to be consistent for up to a scalar multiple, where the instruments &re appropriately defined score vectors of the marginal distribution of X. The fra...