Some regulatory reforms do not change just a specific signal that can be represented by a quantitative continuous variable, such as a tax rate, a price cap, or an emission threshold. The standard theory of reform in applied welfare economics (going back to contributions by e.g. Ramsey, Samuelson...

In 1959, Ragnar Frisch prompted Georg Rasch to formalise a separability theorem that continues today to serve as the basis of a wide range of theoretical and applied developments in psychological and social measurement. Previously unnoted are the influences on Rasch exerted by Frisch’s...

In 1979, the Danish mathematician Georg Rasch recounted a 1959 visit with his former teacher, and later economics Nobel Prize winner, Ragnar Frisch. At this time, Frisch prompted Rasch to formalize his work in a separability theorem. Previously unnoted is that Frisch's close colleague, Irving...

Calyampudi Radhakrishna Rao (Rao for brevity, henceforth) just celebrated his 90th birthday. He received numerous honors including 1972 fellow of Econometric Society and the 2002 US Medal of Science (the citation of which recognized his contributions to economics). He co-founded with Mahalanobis...

David A. Freedman's (DF hereafter) fascinating methodological survey article explains very concisely the principal challenges faced by economists and other social scientists when they aim to test hypotheses using statistical (or econometric) models. He also discusses the principal responses to...

Causal inference is of central interests in many empirical applications yet often challenging because of the presence of endogenous regressors. The classical approach to the problem requires using instrumental variables that must satisfy the stringent condition of exclusion restriction. At the...

Some regulatory reforms do not change just a specific signal that can be represented by a quantitative continuous variable, such as a tax rate, a price cap, or an emission threshold. The standard theory of reform in applied welfare economics (going back to contributions by e.g. Ramsey, Samuelson...

Along present article we have tried to highlights the main contributions of Lawrence R. Klein to applied economics trough his longer career, both as teacher and as researcher. Having in mind the diffi cult task that means to concentrate the huge amount achievements made by the cited author we...