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181.
介绍了在VHF/UHF无线通信系统中进行高速数据传输时 ,采用RS码与卷积码的级联码对传输的数据纠错编码以及对提高数据传输可靠性的影响 ,并在加性高斯白噪声信道环境下对能够达到的误码性能进行了仿真分析。 相似文献
182.
中国居民储蓄行为误差修正模型 总被引:1,自引:1,他引:0
近几年来,居民储蓄持续增加成为人们关注的焦点,央行七次降息且以20%的税率对利息征税,效果不显著。本文用整理论研究了中国居民储蓄行为,建立了误差修正模型,得到了结论。 相似文献
183.
This paper proposes an alternative model for analyzing financial ratio behavior. The model postulates that (1) firms' financial ratios reflect unexpected changes in industry conditions; and (2) managers attempt to move their financial ratio toward the long-run desirable target. This model is employed to assess the relative weights of financial ratio movement that are associated with these two forces. The results show that changes in financial ratios can be due to both external shocks and strategic adjustment by management. The amount of financial ratio smoothing due to strategic adjustment appears to be substantial. Furthermore, the speed of convergence toward the optimal targets varies across industries and firms of different size. 相似文献
184.
185.
In the Italian Time use survey, carried out by Istat (Italian National Statistical Institute) in 2002–2003, the coding process
translates the sentences reported by the respondents into codes, but association text-code is not a one to one easy linkage,
because the respondents describe the activities performed using the common language. So, a process of data editing is requested
in order to improve data quality. The possibility to use sentences (recorded in the data entry) has definitely improved the
data editing process.
The main questions to analyse concern:
This paper shows methodological and contextual choices in order to build the process of data editing. In particular, it is
focused on the analysis of techniques and deterministic rules adopted and on the analysis of imputation system to correct
adequately the wrong codes, with reference to the entire diary.
This paper was presented at the XXVI IATUR (International Association for Time Use Research) Conference held in Rome, 27–29
October 2004. The authors share contents and views expressed in this paper. However, the paragraphs are so drafted: Salvatore
F. Allegra drew up the paragraphs 1, 2, 3, 7; Barbara Baldazzi drew up the paragraphs 4, 5, 6, 8. Salvatore F. Allegra and
Barbara Baldazzi drew up the paragraph 9. 相似文献
(a) | particular ancillary codes used by coders to point out daily diary’s problems; |
(b) | incompatibility between codes and codes and between codes and text; |
(c) | errors in the intervals’ sequences. |
186.
Martin Hoesli Colin Lizieri Bryan MacGregor 《The Journal of Real Estate Finance and Economics》2008,36(2):183-206
Historic analysis of the inflation hedging properties of stocks has produced anomalous results, with stocks often appearing
to offer a perverse hedge. This has been attributed to the impact of real and monetary shocks to the economy, which influence
both inflation and asset returns. It has been argued that real estate should provide a better hedge: however, empirical results
have been mixed. This paper explores the relationship between commercial real estate returns and economic, fiscal and monetary
factors and inflation for US and UK markets. Comparative analysis of general equity and small capitalization stock returns
is carried out with inflation divided into expected and unexpected components. The analyses are undertaken using an error
correction approach. In the long run, once real and monetary variables are included, asset returns are positively linked to
anticipated inflation but not to inflation shocks. Adjustment processes are, however, gradual and not within period. Real
estate returns, particularly private market returns, exhibit characteristics that differ from those of stocks.
相似文献
Bryan MacGregorEmail: |
187.
构建和谐的企业文化,既是企业发展的迫切需要,也是当前建设和谐文化的必然要求。以和谐文化促进企业和谐,实现又好又快发展,不仅关系到企业自身,而且关系到整个社会的和谐发展。文章通过对企业和谐文化建设的意义、建设的途径、应处理好的几个关系等问题的分析,论述了在建设和谐文化中如何建设和谐企业文化这一课题。 相似文献
188.
This paper deals with the issue of testing hypotheses in symmetric and log‐symmetric linear regression models in small and moderate‐sized samples. We focus on four tests, namely, the Wald, likelihood ratio, score, and gradient tests. These tests rely on asymptotic results and are unreliable when the sample size is not large enough to guarantee a good agreement between the exact distribution of the test statistic and the corresponding chi‐squared asymptotic distribution. Bartlett and Bartlett‐type corrections typically attenuate the size distortion of the tests. These corrections are available in the literature for the likelihood ratio and score tests in symmetric linear regression models. Here, we derive a Bartlett‐type correction for the gradient test. We show that the corrections are also valid for the log‐symmetric linear regression models. We numerically compare the various tests and bootstrapped tests, through simulations. Our results suggest that the corrected and bootstrapped tests exhibit type I probability error closer to the chosen nominal level with virtually no power loss. The analytically corrected tests as well as the bootstrapped tests, including the Bartlett‐corrected gradient test derived in this paper, perform with the advantage of not requiring computationally intensive calculations. We present a real data application to illustrate the usefulness of the modified tests. 相似文献
189.
The paper reports estimates of import and export functions for five technological sectors in 14 developed European countries. These functions have never before been estimated for developed countries adopting a technological classification of sectors. The paper compares estimates of income elasticities found using vector error-correction models employing aggregate deflators, with estimates found using cross-product panels employing product-specific quality-adjusted price indexes recently calculated by Feenstra and Romalis. The results indicate that the income elasticities of imports and exports are higher for medium- and high-tech manufactures, which suggests the importance of moving from the production of simple goods to the production of goods with high technological content. The estimates also suggest that the Multi-Sectoral Thirlwall’s Law holds for the countries analysed, while comparing the estimates revealed that cross-product panels with quality-adjusted prices generate considerably more robust results. The investigation reveals that using a more recent time period generates estimates of income elasticities of demand for primary products and resource-based manufactures that tend to be higher than the estimates found by studies that have used longer time periods, while the opposite holds for low-, medium-, and high-tech manufactures. 相似文献
190.
This paper examines international trade and inspection involving tainted products in a model of quality choice, facing fears that globalization is the cause of numerous food incidents. Particularly, we ask the following questions: (i) What are the conditions under which foreign firms choose to produce tainted goods? (ii) Does globalization via freer trade lower product safety? (iii) Why are goods imported even though they are known to be harmful? We show the existence of a free trade Nash equilibrium characterized by production and trade of high-quality non-tainted products. However, free trade cannot prevent the export of tainted goods, because the foreign firm may deviate under different combinations of parameters. We identify self-correcting mechanisms such as nationalism and a political-economy re-allocation of public resources in favor of customs authorities. Nevertheless, we also uncover activities that exacerbate tainted production like errors of testing and sabotage by rival firms. 相似文献