Information about tree biomass is important not only in the assessment of wood resources but also process preparing forest management plans, as well for estimating carbon stocks and their flow ecosystems. The study aimed to develop empirical models determining dry mass aboveground parts black locust trees components (stem, branches, leaves). research was carried out based on data collected 13 s...

Abstract A headline result from the Oregon Health Insurance Experiment is that emergency room (ER) utilization increased. seemingly contradictory Massachusetts health reform ER decreased. I reconcile both results by identifying treatment effect heterogeneity within experiment and extrapolating it to Massachusetts. Even though compliers increased their utilization, they were adversely selected r...