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排序方式: 共有180条查询结果,搜索用时 359 毫秒
91.
In this paper we study the property of linearity of backward regression for non-adjacent records. In the case of weak records, a characterization of the geometric distribution is obtained. It also appears that a related characterization for ordinary records does not hold, showing the difference in conditional behaviour between weak and ordinary records. 相似文献
92.
When a finite population is to be stratified, one of constraints in stratification is that sample sizes from strata may not be greater than the corresponding stratum sizes and may not be smaller than two. There are several ways of treating this allocation constraint, each providing an alternative approach to stratification. In this article, it is shown that a choice of the approach has a bearing on stratification efficiency. Unfortunately, no particular approach out of the four compared is shown to be the most efficient for each population studied. In addition, the approaches are applied to stratify a real population. 相似文献
93.
Michał Chrzanowski 《统计学通讯:理论与方法》2013,42(1):132-141
ABSTRACTThe area under the receiver operating characteristic (ROC) curve is a popular summary index that measures the accuracy of a continuous-scale diagnostic test to measure its accuracy. Under certain conditions on estimators of distribution functions, we prove a theorem on strong consistency of the non parametric “plugin” estimators of the area under the ROC curve. Based on this theorem, we construct some new “plugin” consistent estimators. The performance of the non parametric estimators considered is illustrated numerically and the estimators are compared in terms of bias, variance, and mean square error. 相似文献
94.
95.
Endre Csáki Miklós Csörgő Zdzisław Rychlik Josef Steinebach 《Journal of statistical planning and inference》2007
We study the asymptotic behaviour of stochastic processes that are generated by sums of partial sums of i.i.d. random variables and their renewals. We conclude that these processes cannot converge weakly to any nondegenerate random element of the space D[0,1]. On the other hand, we show that their properly normalized integrals as Vervaat-type stochastic processes converge weakly to a squared Wiener process. Moreover, we also deal with the asymptotic behaviour of the deviations of these processes, the so-called Vervaat-error-type processes. 相似文献
96.
The employment‐driven migrations from Poland to Iceland have largely been pioneered by Polish women. They outnumbered men among Polish residents in this country until the economic boom since 2005 triggered large‐scale male immigration. This trend slowed down with the outbreak of the financial crisis, as the recession severely affected the male‐dominated construction industry. The analysis of Polish female migrants’ working experiences shows that recent inflows are mainly shaped by the nature of labour demand as well as the social policies and care services in Iceland. Although economically integrated, compared with native women Polish women tend to occupy rather disadvantaged positions. They seem concentrated in a few low‐skilled occupations that bring little prestige and low income. On the other hand, they were less affected by the financial crisis, in the sense that many of them maintained work, though some experienced lowering of salaries or reduction of working hours. 相似文献
97.
Jacek Białek 《统计学通讯:模拟与计算》2017,46(5):3588-3598
The Lloyd–Moulton price index does not make use of current-period expenditure data and, as it is commonly known, it allows us to approximate superlative indices, in particular the Fisher price index. This is a very important property for the inflation measurement and the Consumer Price Index bias calculations. In this article, we verify the utility of the Lloyd–Moulton price index in the Fisher price index approximation. We propose a simple modification of that index which reduces the variation of the estimator of an unknown parameter in this index formula. We also examine the influence of the price volatility on the quality of estimation of the parameter from the Lloyd–Moulton formula. 相似文献
98.
Jacek Białek 《统计学通讯:理论与方法》2017,46(14):7134-7146
In this article, we estimate bounds for the expected value of the stochastic Divisia's price index, that is, we assume that prices and quantities of the given commodities are stochastic processes with continuous time. We consider some special case of the stochastic model in which prices and quantities are described by the geometric Brownian motion. It is shown that the precision of this estimation depends rather on the volatility of prices than quantities volatilities. 相似文献
99.
Piotr Białowolski 《Social indicators research》2018,139(1):147-161
This study investigates impact of debt arrears and various consequential compensatory actions on self-reported satisfaction with life and the financial situation. The link between financial difficulties and the responses they demand has rarely been translated into satisfaction measures in the past. This study informs the literature about actual consequences of problems with arrears and impact of different coping strategies on household satisfaction measures. To address the questions at hand, data from the six (2010–2015) waves of the Swiss Household Panel were examined. A panel data model with fixed effects estimator was applied to account for unobserved population heterogeneity and mitigate the issues of omitted variables. The study confirmed that severe debt problems disproportionally affected self-reported satisfaction measures. Responses to arrears, if representing likely long-term solutions, did not signify further deterioration in self-reported measures. However, if arrears required resort to bank credit, disposal of household valuables or borrowing from family and friends, satisfaction with the household financial situation and household head life satisfaction were likely to suffer more. 相似文献
100.
Paweł Michał Mąkosa 《International migration (Geneva, Switzerland)》2018,56(5):137-150
The history of Polish immigration within the United Kingdom is several centuries old. Yet never in its history was such a mass migration as that after the Polish accession to the EU in 2004. During the over ten years that followed, almost a million Poles chose to settle in the United Kingdom. This article reviews and analyses past and present Polish emigration to the United Kingdom. It provides answers to questions regarding who the Polish immigrants are, what work they perform and how they have integrated within British society. It also considers the factors that have influenced the future dynamics of migration from Poland. Based on these, we have formed the hypothesis that while the years of 2004‐2016 saw, statistically, the largest emigration from Poland to the United Kingdom in recorded history, in the future, the number of Polish expatriates living in the United Kingdom will drop or at least the number of newcomers will decrease. 相似文献