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Summary The problem considered in this paper is a generalization of the usual Rao, Hartley and Cochran (RHC) scheme. In the usual RHC scheme the population ofN units is randomly divided inton groups wheren is the size of the sample. In this paper we propose to divide the population under consideration into (n+k) random groups wherek is some positive integer. Then a sample ofn groups is selected by using simple random sampling without replacement (SRSWOR). The expressions for the unbiased estimator of population total, its variance and the unbiased estimate of variance have been obtained under the proposed sheme. The condition under which the proposed sheme is more efficient than the usual RHC scheme has also been investigated. 相似文献
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The main statements in this article are taken from the report ?Untersuchung der Grundlagen und Entwicklungsperspektiven des Bankensektors in Deutschland ‘ for the Federal Ministry of Finance cf. www.diw.de/deutsch/produkte/publikationen/gutachten/aktuell/index.html. 《Economic Bulletin》2004,41(7):235-238
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This paper investigates how a development moratorium affects choices of development timing and land values in a framework
where both the value of developed property evolves stochastically and the development costs are fully irreversible. We assume
that a regulator initially announces that land is not allowed to be developed during a finite period of time in the future.
A developer, thus, must decide whether to develop land before the timing ordinance is imposed, or after it expires. The development
moratorium reduces the developer’s option value from waiting and, thus, accelerates development. We also use simulation analysis
to demonstrate how the other factors that relate to the demand and supply conditions of the real estate market affect this
accelerating effect. 相似文献
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Prof. Dr. Janbernd Oebbecke 《保险科学杂志》2007,96(1):81-95
Most communes insure themselves and thus behave differently than the Federal Government and the Laender. In many cases communes take out insurance although they can in fact bear the covered risks on their own. Based on the assumption that municipal decision-makers behave reasonably, there are further good reasons to effect an insurance contract. The settlement process carried out by the insurance company in the event of damage or loss is such a major factor. Moreover, insurance can also constitute a service for citizens and help to ease conflicts. Finally, it cuts the costs for political transactions. 相似文献
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