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31.
Artur C. B. da Silva?Lopes "mailto:asl@iseg.utl.pt " title= "asl@iseg.utl.pt " itemprop= "email " data-track= "click " data-track-action= "Email author " data-track-label= " ">Email author 《Empirical Economics》2003,28(4):783-794
An empirical example and a simulation study show that much more attention should be devoted to the practical issue of selecting the maximum admissible order of integration for quarterly macroeconomic time series. In fact, it is shown that when that order is too high, one may get (spurious) evidence for an excessive number of unit roots, resulting in an overdifferenced series.Besides introducing a simple and intuitive definition for the order of integration of quarterly time series, this paper also presents a simple testing strategy to determine that order for the case of macroeconomic data.Helpful comments and suggestions from João Santos Silva and Paulo Rodrigues are gratefully acknowledged. I am also grateful to two anonymous referees, whose comments and suggestions helped improving this paper. Obviously, the usual disclaimer applies. This work has also benefited from financial support from Fundação para a Ciência e Tecnologia (FCT), through Programa POCTI (ECO/33778/2000). A previous version of this paper was presented at the Royal Economic Society Conference, March 2002, Warwick. 相似文献
32.
Luiz Artur Ledur Brito Eliane Pereira Zamith Brito Luciana Harumi Hashiba 《Journal of Business Research》2014
This research evaluates cooperation with key suppliers and customers, correlating cooperation to financial performance. Four cooperative behaviors represent cooperation as a multidimensional concept and the research explores the effect of each of these different dimensions of cooperation on performance. Results show that not all cooperative behaviors have similar and positive impacts on performance. Flexibility has no significant effect while shared problem solving has a negative effect. The other two cooperative behaviors, information exchange and restraint in the use of power, have positive impacts on performance. Results also indicate that cooperation with customers affects mostly firm growth while cooperation with suppliers affects firm profitability. Based on a survey of 124 packaging manufacturers, the analysis uses CFA (Confirmatory Factor Analysis) to validate the measurement of constructs and multiple regressions to analyze the relationships between the cooperative behaviors and financial performance. 相似文献
33.
Artur Myna 《Journal of East-West Business》2017,23(4):367-387
The paper focuses on both the economic and noneconomic multilateral relationships inside and outside the TNCs’ own business networks in the processes of the firms’ internalization on the example of foreign direct investment and divestment in breweries in the UK and Poland. The mode of TNCs’ entry in breweries in the mature economy of the UK and transformation economy in Poland is less country specific and more associated with the international environment of network relationships. The paper presents both structures of the international networks connections as well as the ways they have been created. The system analysis is used. 相似文献
34.
35.
Vasco J. C. R. De A. Gabriel Artur C. B. Da Silva Lopes Luis C. Nunes 《Applied economics》2013,45(8):893-900
This study addresses some modelling questions related to the possibility of structural change in models with nonstationary variables. Focusing on cointegration issues, some methodological aspects are discussed, attempting to integrate coherently the several steps of the modelling strategy. These range from unit root to cointegration testing and to testing for instability in the cointegration vector. An empirical example with Portuguese data tries to illustrate the usefulness of this approach, where a simple money demand function is estimated using an error-correction model (ECM). If a break is explicitly allowed in the cointegration vector the forecasting performance of the ECM improves. 相似文献
36.
Artur C. B. da Silva Lopes 《Empirical Economics》2006,31(1):165-182
This paper investigates the properties of Dickey–Fuller tests for seasonally unadjusted quarterly data when deterministic
seasonality is present but it is neglected in the test regression. While for the random walk case the answer is straightforward,
an extensive Monte Carlo study has to be performed for more realistic processes and testing strategies. The most important
conclusion is that the common perception that deterministic seasonality has nothing to do with testing for the long-run properties
of the data is incorrect. Further numerical evidence on the shortcomings of the general-to-specific t-sig lag selection method is also presented.
相似文献
Artur C. B. da Silva LopesEmail: |
37.
Artur Sepp 《Quantitative Finance》2013,13(7):1119-1141
We introduce a jump-diffusion model for asset returns with jumps drawn from a mixture of normal distributions and show that this model adequately fits the historical data of the S&P500 index. We consider a delta-hedging strategy (DHS) for vanilla options under the diffusion model (DM) and the proposed jump-diffusion model (JDM), assuming discrete trading intervals and transaction costs, and derive an approximation for the probability density function (PDF) of the profit-and-loss (P&L) of the DHS under both models. We find that, under the log-normal model of Black–Scholes–Merton, the actual PDF of the P&L can be well approximated by the chi-squared distribution with specific parameters. We derive an approximation for the P&L volatility in the DM and JDM. We show that, under both DM and JDM, the expected loss due to transaction costs is inversely proportional to the square root of the hedging frequency. We apply mean–variance analysis to find the optimal hedging frequency given the hedger's risk tolerance. Since under the JDM it is impossible to reduce the P&L volatility by increasing the hedging frequency, we consider an alternative hedging strategy, following which the P&L volatility can be reduced by increasing the hedging frequency. 相似文献
38.
Rafael G. Burstein Goldszmidt Luiz Artur Ledur Brito 《Journal of Business Research》2011,64(3):273-279
The debate about the impact of environmental constraints on firm performance in developing countries is relevant for business enterprises and governments. However, the academic literature offers limited empirical evidence comparing firm performance in emerging and developed countries. This paper performs a statistical analysis based on a sample of more than 10,000 firms in a 10-year span. A cross-classified 3-level hierarchical linear model allows the estimation of country, industry and country-industry interaction effects, which have roughly the same relative importance each. The analytical procedure is able to estimate the influence of each specific country on firm performance and produce a ranking of nations based on this effect. Country effects have a greater positive influence on firm performance in emerging countries than in more developed economies. 相似文献
39.
Ricardo Vinícius Dias Jordão Antônio Artur Souza Ewerton Alex Avelar 《Journal of Business Research》2014
This paper analyzes the effect of organizational culture on the post-acquisition management control system (MCS) of the Brazilian company Extrativa Metalquímica Inc. after its acquisition by the FASA Participações Group. The results herein reported add to discussions of the subject and contribute to reducing the research gap in this area in Brazil. The analysis supports two major conclusions: (1) changes in the acquired company's MCS were derived from the new financial results-oriented culture introduced by the acquirer; and (2) the implementation of this culture implied modifications in production, financial and quality controls. 相似文献
40.
We study the relationship between firm value and investment to test the underinvestment and overinvestment hypotheses. The results obtained, using panel data methodology as the estimation method, indicate that the abovementioned relation is quadratic, which implies that there exists an optimal level of investment. As a consequence, firms that invest less than the optimal level suffer from an underinvestment problem, while those investing more than the optimum suffer from overinvestment. The quadratic relation is maintained when firms are classified depending on their investment opportunities, the optimum being in accordance with the quality of investment opportunities. 相似文献