In this paper, we propose a data-driven model selection approach for the nonparametric estimation of covariance functions under very general moments assumptions on the stochastic process. Observing i.i.d replications of the process at fixed observation points, we select the best estimator among...

T-bills were introduced in 1995 and are still one of the most important instruments of the securities market of Armenia (85-95% of all operations of the secondary market in the last five years). The maturity yield of the state bonds during the last 7 years has been between 20% to 100%. Despite...