一般Gauss－Markov模型下一般可估函数的线性充分性和线性完全性

发展了Ｂａｋｓａｌａｒｙ和Ｄｒｙｇａｓ提出的一般Ｇａｕｓｓ－Ｍａｒｋｏｖ模型中线性充分性、最小充分性和完全性的概念，用Ｒａｏ的最小二乘统一理论，给出了这些概念的刻划定理。     

近代小说观念的转型特征和体认

新小说肩负着匡世新民的历史重任登上晚清民初的主流文坛,对传统的检讨与对异域文学的吸纳,形成中国小说观念转型进程继承和反叛的时代特质。中国小说观念展示了社会文化和时代环境选择的巨大威力,中国文学气脉和小说精神在断裂与延续的文学生态中走向崇高,小说观念在自新和他新的文学征程中,实现了文类地位和审美取向的时代转变。     

思辨“必需”与“够用”

在职业技术教育中 ,对文化基础理论课教学的“必需”、“够用”观点 ,出现了认识及实践上的偏颇。为了能正确认识“必需”与“够用”观点 ,使其在指导实践中发挥应有作用 ,本文提出了“适度”基础上的“够用”,“充分”前提下“必需”的观点 ,以满足素质教育和创新教育的需要。     

Sufficiency of a sufficient statistic for equivariant estimation

Suppose an estimation problem is invariant under a group of transformations and one is interested in finding an optimal equivariant estimator. The usual proactice is to confine attention to non-randomized equivariant estimators based on a minimal sufficient statistic. A justification of this restriction to a smaller clas of estimators is given in this paper under certain conditions.     

加强语篇意识提高阅读能力

在英语教学中 ,加强学生的篇章阅读意识是提高学生阅读理解能力的有效途径之一。注意加强学生的篇章阅读意识 ,不仅可以提高阅读能力 ,而且有助于学生养成良好的英语阅读习惯     

On estimating the conditional probability of discovering a new species

Based on a capture-recapture sample of size $i;n+k,n≥ l,k ≥ 0, from a population of an unknown number of distinct species (or classes), the problem of estimating the total probability of the species unobserved in the first n selections is considered. As the estimand depends on both the unknown parameters and the data, the standard theory of estimation is inadequate for this problem A suitable definition of sufficiency is introduced and used to prove a Rao-Blackwell type result and discuss uniformly minimum mean squared error unbiased estimation. An alternative proof for an inadmissibility result is presented. The new proof gives more insight and a method for deriving improved estimators. The theoretical developments may be useful in other problems concerning inferences about random parametric functions.     

Basu's Lemma and Goodness-of-Fit Tests

In this paper we develop a technique that is useful in goodness of fit problems with nuisance location and scale parameters. Using Basu's lemma, we transform the sample so that it is independent of the nuisance parameters. The technique will be illustrated by several examples, a discussion of the efficiency of the proposed procedure, and some concluding remarks will given.     

Financial self‐sufficiency or return to welfare? A longitudinal study of mothers among the working poor

Cheng T. Financial self‐sufficiency or return to welfare? A longitudinal study of mothers among the working poor Int J Soc Welfare 2010: 19: 162–172 © 2010 The Author(s), Journal compilation © 2010 Blackwell Publishing Ltd and International Journal of Social Welfare. This study investigated how working‐poor mothers who withdrew from a US government assistance program were affected by the economy, welfare reform policies, and their own human capital, in terms of their likelihood of returning to welfare and their likelihood of becoming nonpoor through work. The study employed longitudinal data (covering 42 months) extracted from a national data set. The sample for the current study, which relied on event history analysis, consisted of 228 working‐poor former welfare mothers. Results showed that the women's return to welfare was correlated to high unemployment, restrictive welfare policies, enrollment in Medicaid and food‐stamp programs, possession of service‐job skills, and being Hispanic. The women were most likely to attain relative financial independence in the presence of generous government assistance program policies, housing assistance, full‐time employment, operative‐job skills, college education, and marriage. African American ethnicity also made achievement of financial independence more likely.     

When Are Local Incentive Constraints Sufficient?

We study the question of whether local incentive constraints are sufficient to imply full incentive compatibility in a variety of mechanism design settings, allowing for probabilistic mechanisms. We give a unified approach that covers both continuous and discrete type spaces. On many common preference domains—including any convex domain of cardinal or ordinal preferences, single‐peaked ordinal preferences, and successive single‐crossing ordinal preferences—local incentive compatibility (suitably defined) implies full incentive compatibility. On domains of cardinal preferences that satisfy a strong nonconvexity condition, local incentive compatibility is not sufficient. Our sufficiency results hold for dominant‐strategy and Bayesian Nash solution concepts, and allow for some interdependence in preferences.     

Estimation in singular partitioned,reduced or transformed linear models

A singular partitioned linear model, i.e. the singular model comprising the main parameters and the nuisance parameters, can be reduced, or transformed to the form in which only linear functions concerning main parameters are involved. In the paper some properties of the best linear unbiased estimators of these functions following from these models are considered.