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131.
132.
Joachim Zietz 《Atlantic Economic Journal》1995,23(4):310-317
The purpose of this paper is to show that the definition of market efficiency based on rational expectations presents serious problems for empirical hypothesis testing on data that consist of equally spaced observations. Indeed, one can argue that the efficient market hypothesis is, in a strict sense, immune from empirical falsification for the typical data set. This idea is developed for an application of the efficient market hypothesis to the foreign exchange market, i.e., the notion that the forward exchange rate is an unbiased and efficient predictor of future spot exchange rates. 相似文献
133.
Joachim Engel 《Metrika》1997,46(1):41-57
We introduce a new method for locally adaptive histogram construction that doesn’t resort to a standard distribution and is
easy to implement: the multiresolution histogram. It is based on aL
2 analysis of the mean integrated squared error with Haar wavelets and hence can be associated with a multiresolution analysis
of the sample space. 相似文献
134.
On the Determinants of Mandatory Works Councils in Germany 总被引:1,自引:0,他引:1
German works councils are often thought of as operating in all firms that exceed the basic size threshold (of five permanent employees) established under law. Drawing on a new large-scale, representative German data set, we report that only one-fifth of firms in our sample have works councils even if such firms do account for almost three-fourths of employment. The principal factors behind works council presence emerge as fairly conventional: firm size, firm age, branch plant status, the gender composition of the work force, and certain working arrangements. There are also signs of a close relation between workplace union density and council presence. However, some controversial causal links suggested in an earlier econometric literature receive little support. 相似文献
135.
Priv. Doz. Dr. med. Dieter Joachim Ziegenhagen 《保险科学杂志》2006,95(2):319-331
Alcoholic liver disease, non alcoholic fatty liver and chronic viral hepatitis have a high prevalence in the German population. They are associated with significantly increased occupational disability and mortality. Elevated levels of GGT or ALT can be found in about 10 % of the general population. Attempts to identify an underlying diagnosis often remain unsuccessful. In selected cases CDT can be helpful to confirm or rule out suspected alcohol-abuse. Recent studies showed that non alcoholic steatohepatitis (NASH) is a potentially severe complication of diabetes and its metabolic precursors. Treatment options for chronic viral hepatitis get more and more sophisticated, but the rates of sustained cure are still unsatisfactory, especially in hepatitis B with negative HBe-antigen and the hepatitis C genotypes 1, 4 and 5. Life long suppression of HBV replication by nucleoside analogues seems to prevent liver cirrhosis, but may become a great burden on health costs. The risk assessment of HBV carriers and of patients with successfully treated viral hepatitis should rely on the expertise of experienced physicians. 相似文献
136.
137.
Joachim Betz 《Intereconomics》1990,25(3):125-130
138.
139.
It is shown that the joint unconditional density function of demand and supply is a computable function of parameters of the conditional density function of the observed quantity. Propositions of formulating unconditional and conditional disequilibrium measures are suggested. 相似文献
140.
Agriculture and rural growth promotion show a recent 'comeback' in development cooperation, but action on the ground so far is not sufficient. After years of neglect, policy makers have recognized that poverty reduction in many low income countries can only be achieved if development efforts are clearly focused on the sector which employs most of the poor, and the space where most of the poor live. The importance of agricultural growth was amply demonstrated during the economic transformation of Asia. Forty years ago, Asia was a continent of widespread poverty. Today, most Asian countries are experiencing significant growth and poverty reduction. Rapid growth in productivity in the small-farm sector helped drive this process. Sub-Saharan Africa, however, failed to achieve rapid agricultural growth and remains mired in poverty and hunger. If Africa is to halve poverty by 2015 in accordance with the Millennium Development Goals (MDG), agriculture will need to maintain an annual growth rate of 6 per cent between 2000 and 2015. China's experience from 1978 to 1984 shows such growth is possible. Achieving the desired rapid rates of growth in Africa will require coherent policies by governments and donors, a substantial investment of public resources in rural infrastructure and access to agricultural technology, and significant improvement in national governance. 相似文献