The paper explores in detail the intricate relationship between the results of the quantum-chemical calculations and the approximations they rely upon. When chemists want (or need) to include some ...

The Nature Index 2025 Research Leaders — previously known as Annual Tables — reveal the leading institutions and countries/territories in the natural and health sciences, according to their output in ...

This is a preview. Log in through your library . The Annals of Statistics publishes research papers of the highest quality reflecting the many facets of contemporary statistics. Primary emphasis is ...

This is a preview. Log in through your library . Abstract This paper derives the exact probability density function of instrumental variable estimators of the coefficient vector of the endogenous ...