Search results for "Econometric"

UNEMPLOYMENT PERSISTENCE AND THE SUSTAINABILITY OF EXCHANGE RATE PEGS

2010

Published in Scottish Journal of Political Economy, Volume 57, No. 1, February 2010: 85-102

A note on change in persistence of U.S. city prices

2020

Abstract This paper seeks to explain the high persistence in U.S. price differentials found in Cecchetti, S. G., N. C. Mark, and R. J. Sonora. 2002. “Price Index Convergence Among United States Cities.” International Economic Review 43: 1081–99, by means of the concept of change in persistence. To that end, have computed recently developed tests by Kejriwal, M., P. Perron, and J. Zhou. 2013. “Wald Tests for Detecting Multiple Structural Changes in Persistence.” Econometric Theory 29: 289–323, allowing for multiple changes in persistence under the alternative hypothesis. We conclude that change in persistence cannot be ruled out for some city price differentials.

WITHDRAWN: Corrigendum to “Detection of change in persistence of a linear time series”: [J. Econom. 95 (2000) 97–116]

2001

How important is culture to understand political protest?

2021

Abstract The literature considers nonviolent protests among the most important predictors of transitions towards democracy and democratic reforms. This study addresses the conditionsmaking countries more likely to experience nonviolent instead of violent forms of protest. While the literature emphasizes economic and political predictors of protest at the country level, we expand the study of nonviolent-vs-violent protest by incorporating cultural predictors. To do so, we use a newly developed time-pooled cross-sectional database covering an established set of orientations from the World Values Survey, known as “emancipative values”. Estimating the prevalence of these values at the country l…

The stability of genetic variance?covariance matrix in the presence of selection

2007

Quantitative genetics provides one of the most important frameworks in which evolutionary biology and evolution can be studied. The primary goals of this field of study include the attempts to understand the history of selection that has resulted in the multiple phenotypic traits we observe today, and to predict the future trajectory of the multiple traits. Within quantitative genetics it is the genetic variance–covariance matrix G which summarizes the additive genetic variation of multiple traits and the genetic covariances between the traits, together with selection that control the direction and rate of evolution. The product of these two elements determine the response to selection from…

Création des pôles de compétitivité et salaire des ingénieurs,

2015

En ligne sur http://rei.revues.org/6151; National audience; La création des pôles de compétitivité en France a permis un investissement massif dans des projets de RD dans certains territoires. S'appuyant sur le développement de synergie entre les entreprises, les centres de recherche et les établissements de formation, ces pôles devraient favoriser une politique de ressources humaines propice à l'innovation. Notre recherche propose d'examiner l'effet de la création de ces pôles sur le salaire des diplômés des écoles d'ingénieurs. Une méthode de « différence de différence » avec appariement est utilisée pour comparer les rémunérations des jeunes diplômés avant et après la création des pôles.…

Parametric nonlinear singular Dirichlet problems

2019

Abstract We consider a nonlinear parametric Dirichlet problem driven by the p -Laplacian and a reaction which exhibits the competing effects of a singular term and of a resonant perturbation. Using variational methods together with suitable truncation and comparison techniques, we prove a bifurcation-type theorem describing the dependence on the parameter of the set of positive solutions.

Multivariate equivalence tests for use in pharmaceutical development.

2014

Statistical equivalence analyses are well-established parts of many studies in the biomedical sciences. Also in pharmaceutical development and manufacturing equivalence testing methods are required in order to statistically establish similarities between machines, process components, or complete processes. This article presents a choice of multivariate equivalence testing procedures for normally distributed data as generalizations of existing univariate methods. In all derived methods, variability is interpreted as nuisance parameter. The use of the proposed methods in pharmaceutical development is demonstrated with a comparative analysis of dissolution profiles.

Ancora sulla scelta degli investimenti

1985

Il caso in cui il criterio del tasso di rendimento interno per la scelta tra investimenti cade in difetto ha dato l'avvio ad una vasta letteratura, [1], [3], [4], [6], [8], [9], ed a proposte di nuosi effettua una generalizzazione della valutazione di un progetto di investimento con il metodo dei saldi; si estende tale generalizzazione anche al caso continuo e a quello aleatorio; sotto particolari condizioni dei tassi si studia il saldo del progetto come una particolare classe di polinomi; viene infine proposto un nuovo criterio di scelta.

When do improved covariance matrix estimators enhance portfolio optimization? An empirical comparative study of nine estimators

2011

The use of improved covariance matrix estimators as an alternative to the sample estimator is considered an important approach for enhancing portfolio optimization. Here we empirically compare the performance of 9 improved covariance estimation procedures by using daily returns of 90 highly capitalized US stocks for the period 1997-2007. We find that the usefulness of covariance matrix estimators strongly depends on the ratio between estimation period T and number of stocks N, on the presence or absence of short selling, and on the performance metric considered. When short selling is allowed, several estimation methods achieve a realized risk that is significantly smaller than the one obtai…