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1.
The general consensus in the volatility forecasting literature is that high-frequency volatility models outperform low-frequency volatility models. However, such a conclusion is reached when low-frequency volatility models are estimated from daily returns. Instead, we study this question considering daily, low-frequency volatility estimators based on open, high, low, and close daily prices. Our data sample consists of 18 stock market indices. We find that high-frequency volatility models tend to outperform low-frequency volatility models only for short-term forecasts. As the forecast horizon increases (up to one month), the difference in forecast accuracy becomes statistically indistinguishable for most market indices. To evaluate the practical implications of our results, we study a simple asset allocation problem. The results reveal that asset allocation based on high-frequency volatility model forecasts does not outperform asset allocation based on low-frequency volatility model forecasts. 相似文献
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Conclusions Up to now, specific historical development is reflected in ideological views predominant in the USSR. Many people continue to place their hopes mainly in the activity of the bodies of state power and administration, not in private initiative. An interrelated implementation of political and economic reforms will contribute to the development of new theory and ideology. It will then be possible to combine a pragmatic and theoretical approach, and to accelerate the reform of the Soviet economy [theoretical, practical and historical aspects connected with the problem of property are considered in more detail by the author in his bookEconomics and the Law soon to be published by the Economics publishing house in Moscow]. 相似文献
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While recent research into foreign direct investment (FDI) has focused on examining the importance of institutions, corruption, money laundering, and tax havens, the role of globalization on FDI has not yet been explored. This research investigates the impacts of globalization on outward FDI. We find that both overall globalization and its economic and social dimensions significantly positively influence outward FDI flows. We also demonstrate that beyond the level of globalization, corruption, money laundering, and the status of a country as a tax haven, cross-country similarity also plays an important role. Accordingly, policies specifically designed to increase the transparency of outward FDI flows should be required to address money laundering and the existence of tax havens. 相似文献
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Stanislav Avsec Janez Jamšek 《International Journal of Technology and Design Education》2016,26(1):43-60
Technological literacy is identified as a vital achievement of technology- and engineering-intensive education. It guides the design of technology and technical components of educational systems and defines competitive employment in technological society. Existing methods for measuring technological literacy are incomplete or complicated, unreliable, unstable and imprecise, time-consuming, and require large expenditures on resources. This paper presents a new method for valid and reliable measuring of technological literacy. The method encompasses three main components—knowledge, capabilities, and critical thinking and decision-making. It is centred on the standards for technological literacy issued by the International Technology and Engineering Educators Association. It has three key features. (1) A construct-measure-result front-ended approach, where a construct consists of an object, attribute, and entity; which causes reduction of measure-induced distortion and error. (2) A broad test range definition that provides stable and accurate measuring of technological literacy for 6–18-year-old students. (3) A genuine design approach including a multiple choice test item form determination consisting of content, criterion and construct validity, item discrimination, difficulty index, and an intraclass correlation measure for time stability and scooping its heterogeneous nature. Only the method is described herein and its pilot test results are presented. It is moderately reliable over time (intraclass correlation coefficient = 0.68, p < 0.05), has high criterion-related validity (r xy < 0.4) and construct validity (h 2 > 0.7). High content validity evidence was ensured through a two-stage validation method, while test item discrimination coefficient values are acceptable (r pbis > 0.1). The method is time-efficient (measuring lasts 45 min), valid, stable, and enables holistic investigation of large sample sizes. 相似文献
5.
Hofmann Alois Hošková-Mayerová Šárka Talhofer Václav Kovařík Vladimír 《Quality and Quantity》2015,49(4):1679-1691
Quality & Quantity - The content of this article is a paper about a complex mathematical model of terrain passability which respects geographical and meteorological conditions in terrain and... 相似文献
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Vytautas Dikčius Indrė Pikturnienė Eleonora Šeimienė Vilmantė Pakalniškienė Monika Kavaliauskė James Reardon 《Journal of Promotion Management》2019,25(2):252-269
Do children overestimate their engagement in parental purchase decisions? A systematic analysis of the articles enabled us to create a database of 149 cases where child and parent perceptions of children's engagement in parental purchase decisions were measured. The findings proved that there is congruence between children's and parents' perception of a child's engagement in most cases. Children's overestimation of their engagement in a parental decision to purchase products is likely the exception rather than the rule. The cases characterized as overestimations are related to product category and type of measured domain. (Children tend to overestimate their engagement more when the measures track participation or influence rather than decision independence.) 相似文献
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Martina Francesca Ferracane Janez Kren Erik van der Marel 《Review of International Economics》2020,28(3):676-722
This paper examines how policies regulating the cross‐border movement and domestic use of electronic data on the internet impact the productivity of firms in sectors relying on electronic data. In doing so, we collect regulatory information on a group of developed economies and create an index that measures the regulatory restrictiveness of each country's data policies. The index is based on observable policy measures that explicitly inhibit the cross‐border movement and domestic use of data. Using cross‐country firm‐level and industry‐level data, we analyse econometrically the extent to which these data regulations over time impact the productivity performance of downstream firms and industries, respectively. We show that stricter data policies have a negative and significant impact on the performance of downstream firms in sectors reliant on electronic data. This adverse effect is stronger for countries with strong technology networks, for servicified firms, and holds for several robustness checks. 相似文献
10.
Job crafting offers several beneficial organizational outcomes, yet little is known about what makes employees engage in it. In particular, the role of leaders in influencing their subordinates to engage in job crafting has been insufficiently studied. Drawing on role theory, we suggest that the congruence of leader‐subordinate autonomy expectations nurtures subordinates’ experiences of having their competences adequately utilized in their jobs. This experience, which involves the competence mobilization of their work roles, subsequently fosters subordinates’ engagement in job‐crafting behavior. A two‐stage field study of 145 leader‐subordinate dyads using cross‐level polynomial regression and response surface analysis supported the (in)congruence hypotheses. The results also demonstrated that subordinates’ perceived competence mobilization mediates the relationship between autonomy expectation (in)congruence and job crafting. In addition, leader coalition as a moderator strengthens the effect of perceived competence mobilization as a psychological condition for job crafting. Implications for practice and future research are discussed. © 2016 Wiley Periodicals, Inc. 相似文献