不等概率抽样估计的原理与应用

不等概率抽样估计是一种十分有效的抽样推断方法,它在实践中有着广泛的应用,采用不等概率抽样修正等概率抽样,可以弥补抽样调查中等概率抽样估计的不足。以对2007年全国各地区接待的入境旅游人数进行估计为例,在不等概率抽样原理的基础上,抽取样本,采用适当的方法进行测算,才能达到提高抽样估计效率的目的。     

担保债权凭证之评价——多因子模型和KMV模型之探讨

探讨担保债权凭证商品之评价，包含缩减式模型及结构式模型两种研究方法；前者以多因子相关性模型，而後者以KMV模型为方法探讨之主轴。多因子相关性模型中资产的违约分配函数分别假设为指数、韦伯及Burr分配；再分别结合Gauss Copula或t5 Copula函数，估计商品的信用价差。实证分析以台湾“玉山银行债券资产证券化特殊目的信托2005—1受益证券”为例。实证研究结果发现，指数分配之信用价差估计值偏大，Burr分配估计值最小；t5 Copula函数之信用价差估计值都较Gauss Copula函数之估计值大。此外，将数据作适当调整後应用KMV模型之信用价差估计值比多因子相关性模型之估计值大。     

The duration of new firms in banking: an application of Cox regression analysis

This paper studies the duration of two cohorts of entrants in the Italian financial intermediation industry. Using the Cox (1972) Proportional Hazards Model, it analyses the link between duration of each newborn firm and its start-up size, as well as a series of industry-specific characteristics. It emerges that not only did regulatory reform in 1990 result in a process of branch proliferation and industry concentration, but it also set in motion a pre-entry selection mechanism. Conversely, before completion of the regulatory reform, in 1989, entry was possible even for very small firms, and larger new entrants survived longer than their smaller counterparts, and this independently of the features of spatial and structural competition. First version received: Nov. 98/final version received: Oct. 99     

Neue Sterblichkeitstafeln der “Varma” für minderwertige Leben

Abstract

Die in der Versicherung minderwertiger Leben angewendeten hypothetischen Sterblichkeitstafeln zerfallen ihrem Klassifizierungsgrunde nach in zwei Gruppen: die Klassifizierung gründet sich 1:0 auf die Art der Minderwertigkeitsursache, 2:0 auf den geschatzten Grad der Minderwertigkeit.     

基于信息不对称非上市公司贷款违约研究

针对非上市企业融资困难的现状,从信息不对称角度出发,采用贷款抵押,利用修正的自由现金流模型估计非上市企业的价值,并结合企业的债务结构,建立了信息不对称下非上市企业信用风险模型,建立了企业的违约概率的预测模型,探讨了企业最大债务规模,并分析了贷款违约挽回率。     

A note on the connection between factorial series distribution and zero-truncated power series distribution

Summary

The main purpose of this note is to call attention to the close relationship between the problem of estimating the parameter of a zero-truncated power series distribution and the problem of estimating the parameter of an associated factorial series distribution. We also extend a known recurrence property for the Poisson case to the binomial and negative binomial cases.     

Insurance premiums under demand constraints

Abstract

An alternative approach to the variance principle of premium determination is explored. The approach rationalises the principle in terms of an economic theory and formalises the notion that loadings in addition to the ‘fair’ premium are related to competition and expenses.     

Ruin Probabilities for Insurance Models Involving Investments

In this paper we study the ruin problem for insurance models that involve investments. Our risk reserve process is an extension of the classical Cramér-Lundberg model, which will contain stochastic interest rates, reserve-dependent expense loading, diffusion perturbed models, and many others as special cases. By introducing a new type of exponential martingale parametrized by a general rate function, we put various Cramér-Lundberg type estimations into a unified framework. We show by examples that many existing Lundberg-type bounds for ruin probabilities can be recovered by appropriately choosing the rate functions.     

Run length and the predictability of stock price reversals

Survival analysis is used to estimate time‐varying probabilities of price reversals using daily data for the Australian All Ordinaries Price Index. Lagged price changes lead to persistence (shortening) in a price run if they are of the same (opposite) sign as the run. An increase in the number of runs observed in the previous 30 days also increases the probability of price reversal. The predictive accuracy of the models is assessed using a probability scoring rule. Consistent with market efficiency, the estimated models are less accurate than the random walk model in predicting the length of individual price runs out‐of‐sample.     

Parental Income and Continuing Education of Second Generation Immigrants in Sweden

Understanding the economic integration of minority ethnic communities requires an analysis of the educational process. This paper examines second‐generation immigrant youths’ educational attainments in comparison with those of similarly aged native Swedes. Binomial‐logit, grouped‐regression and multinomial‐logit models are applied to longitudinal data, 1991–1996. The results give evidence for socioeconomic determinants of post‐compulsory education and for parental influence on educational choices. Parental income affects second‐generation immigrants’ post‐compulsory education and Swedes’ choice of level of education. In general, the stronger the labour market positions of the parents, the higher the probability of the children continuing education. It is also found that the geographical origin of second‐generation immigrants matter, with youths of Asian origin having a higher probability of continuing their education. We suggest policy changes on different levels based on the evidence of the paper, as short‐run, long‐run and in general.