Sampling refugee groups: The example of Syrians in Turkey

Quantitative surveys among refugees not only advance our scientific understanding of forced migration, but they also provide political and civil society actors with the information they need to take measures to improve their protection and living conditions. These actors often need to acquire such information within a short period of time. However, the methods to access and survey this group to gain valid findings are subject to scientific debates. Based on a survey among Syrian refugees in Turkey, this article demonstrates a study design that generated valid knowledge about this population within a limited amount of time and resources. As a unique feature of the article, we compare our sample with four other sources of information to scrutinize how well it resembles the target population. As we can show, although point estimations differ to some extent, the internal distributions of sample characteristics are comparable across sources confirming the success of our sampling method.     

On the limiting distributions of the jackknife statistics for eigenvalues of a sample covariance matrix

The limiting distributions of jackknife statistics for eigenvalues of a sample covariance matrix are derived under the nonnormal situations. Also the numerical examples are given under normal and nonnormal populations.     

A note on the determination of sample sizes for hypergeometric distributions

Sample size determination for testing the hypothesis of equality of two proportions against an alternative with specified type I and type II error probabilities is considered for two finite populations. When two finite populations involved are quite different in sizes, the equal size assumption may not be appropriate. In this paper, we impose a balanced sampling condition to determine the necessary samples taken without replacement from the finite populations. It is found that our solution requires smaller samples as compared to those using binomial distributions. Furthermore, our solution is consistent with the sampling with replacement or when population size is large. Finally, three examples are given to show the application of the derived sample size formula.     

谢灵运和谢朓山水诗内容与形式比较研究

谢灵运和谢胱文学成就都在山水诗上,但是成就各不相同.谢灵运的山水诗主要描写山水老林;而谢胱则主要描写都邑宫殿或寻常庭园.谢灵运采用先景物描写结尾阐发玄理;而谢胱则达到了情景交融.谢灵运山水诗有“贵巧似”的特征;而谢胱的山水诗却流畅而无挂碍.     

The diversity dividends of a need-blind and color-blind affirmative action policy

In the early to mid-2000s, four flagship Israeli selective universities incorporated a need-blind and color-blind affirmative action policy into their admissions practices. The program, which gives an edge in admission to academically borderline applicants from disadvantaged backgrounds, emphasizes structural disadvantages, such as neighborhood socioeconomic status and high school rigor. The results of this study, based on administrative data from the four universities, demonstrate that having such a policy in place made the four institutions, especially the echelons at the most selective departments, more diverse than they otherwise would have been. The rise in geographic, economic and demographic diversity of a student population suggests that the plan’s focus on structural determinants of disadvantage yields broad diversity dividends. The paper discusses the relevance of the findings to the ongoing discussion of admission regimes, diversity and equality of opportunity in the US.