Originally published in 1951, this volume reprints the classic work written by one of the leading global econometricians. Econometrics is structured as followed: Part 1 explains the relationship of Econometrics to Economics and Statistics. Part 2 outlines the process of formulating economic hypotheses mathematically and of subjecting them to a statistical test. Part 3 deals with the various component equations of the economic system - the psychic reactions, technical relations and reactions of business life and describes the process of setting up an economic model of the system as a whole. Part 4 llustrates the use of econometric methods for policy purposes.