India's Mahatma Gandhi National Rural Employment Act: Assessing the quality of access and adequacy of benefits in MGNREGS public works

The extension of social protection to all has become a central policy objective, both nationally and internationally. A considerable number of middle‐ and low‐income countries have undertaken substantial efforts to extend social protection, while the international community reaffirmed its commitment to the extension of social protection through the adoption of the ILO Recommendation concerning National Floors of Social Protection, No. 202 (2012). This article reviews the legal provisions and the implementation of the Indian Mahatma Gandhi National Rural Employment Guarantee Act (MGNREGA), legislated in 2005, and does so in the light of the more recent provisions of ILO Recommendation No. 202. Since its introduction ten years ago, MGNREGA has provided a source of income to rural workers, increased wage rates, achieved high female participation rates and created durable assets. India's local governance bodies, Panchayati Raj Institutions (PRI), have been empowered and involved in the processes of planning and monitoring. However, despite successes, there have been considerable shortcomings in implementation. This article highlights two central themes: first, the innovative policy framework of the Act, which brings together rights‐based entitlements, demand‐driven employment, and citizen‐centred monitoring. Second, it assesses the accessibility and adequacy of benefits in the implementation of MGNREGA. We conclude that MGNREGA offers potential for South‐South learning, both in terms of policy‐design and implementation.     

Using a Truncated C p Statistic for Variable Selection in Multiple Linear Regression

In multiple linear regression analysis each lower-dimensional subspace L of a known linear subspace M of ? ⁿ corresponds to a non empty subset of the columns of the regressor matrix. For a fixed subspace L, the C _p statistic is an unbiased estimator of the mean square error if the projection of the response vector onto L is used to estimate the expected response. In this article, we consider two truncated versions of the C _p statistic that can also be used to estimate this mean square error. The C _p statistic and its truncated versions are compared in two example data sets, illustrating that use of the truncated versions may result in models different from those selected by standard C _p .     

A Simple Method for Testing Variance Components in Unbalanced Nested Model

In this article, we consider the unbalanced case of the three fold nested random effects model under partial balance. The distributions of unweighted sums of squares are obtained first. Using the method of generalized p value introduced in Tsui and Weerahandi (1989 Tsui , K. , Weerahandi , S. ( 1989 ). Generalized p-values in significance testing of hypotheses in the presence of nuisance parameters . Journal of the American Statistical Association 84 : 602 – 607 .[Taylor & Francis Online], [Web of Science ®] , [Google Scholar]), a new method is proposed for hypothesis tests involving functions of variance components. To evaluate the sizes of the generalized p value, a simulation study is conducted. The results indicate that the proposed method performs well under all examined conditions.     

企业外汇风险暴露研究——基于中国上市公司的经验数据

以是否具有外销收入为标准,选取在深交所上市的67家公司为样本,就其是否存在显著外汇 风 险暴露及暴露系数的符号与大小进行研究。实证结果发现,在0.1的显著水平下,有7家公司 外 汇风险暴露系数显著为正,12家公司外汇风险暴露系数显著为负。分析这些公司系数 符号存在差异的原因发现,系数为正的部分公司在以毛利率减少为代价换取外销收入的 增加。最后,对影响公司暴露系数大小的因素进行了分析。     

Closure,connectivity and degree distributions: Exponential random graph (p*) models for directed social networks

The new higher order specifications for exponential random graph models introduced by Snijders et al. [Snijders, T.A.B., Pattison, P.E., Robins G.L., Handcock, M., 2006. New specifications for exponential random graph models. Sociological Methodology 36, 99–153] exhibit substantial improvements in model fit compared with the commonly used Markov random graph models. Snijders et al., however, concentrated on non-directed graphs, with only limited extensions to directed graphs. In particular, they presented a transitive closure parameter based on path shortening. In this paper, we explain the theoretical and empirical advantages in generalizing to additional closure effects. We propose three new triadic-based parameters to represent different versions of triadic closure: cyclic effects; transitivity based on shared choices of partners; and transitivity based on shared popularity. We interpret the last two effects as forms of structural homophily, where ties emerge because nodes share a form of localized structural equivalence. We show that, for some datasets, the path shortening parameter is insufficient for practical modeling, whereas the structural homophily parameters can produce useful models with distinctive interpretations. We also introduce corresponding lower order effects for multiple two-path connectivity. We show by example that the in- and out-degree distributions may be better modeled when star-based parameters are supplemented with parameters for the number of isolated nodes, sources (nodes with zero in-degrees) and sinks (nodes with zero out-degrees). Inclusion of a Markov mixed star parameter may also help model the correlation between in- and out-degrees. We select some 50 graph features to be investigated in goodness of fit diagnostics, covering a variety of important network properties including density, reciprocity, geodesic distributions, degree distributions, and various forms of closure. As empirical illustrations, we develop models for two sets of organizational network data: a trust network within a training group, and a work difficulty network within a government instrumentality.     

粮食大省的产粮优势转变为区域综合经济优势研究

我国粮食主产区产粮优势在向区域综合经济优势转变的过程中存在一定的障碍和困难,如政策激励、人地矛盾、农业弱质性、结构调整滞后性、优势转化平台等方面。从国家粮食安全的战略高度出发,应加强将粮食主产区产粮优势转变为区域综合经济优势,这就需要从利益调节机制、现代农业生产理念、完善农村经营制度和构建农业生产要素平台等多种视角,寻求一系列富有现实针对性和实际操作性强的对策措施。     

2,3-二氰基-2,3-二(p,m-甲氧基苯基)丁二酸二乙酯在苯乙烯中的分解动力学

:用膨胀法测定了 2 ,3-二氰基 - 2 ,3-二 (p ,m -甲氧基苯基 )丁二酸二乙酯 (meso/dl=0 .15 6 9)在苯乙烯中的分解动力学 .与以前的实验结果相比较 ,dl异构体含量增加 ,分解活化能增大 .所得活化参数Ed =88.5 4kJ/mol,ΔS≠ =- 5 8.78J/mol.K .     

Statistical analysis for rounded data

When random variables do not take discrete values, observed data are often the rounded values of continuous random variables. Errors caused by rounding of data are often neglected by classical statistical theories. While some pioneers have identified and made suggestions to rectify the problem, few suitable approaches were proposed. In this paper, we propose an approximate MLE (AMLE) procedure to estimate the parameters and discuss the consistency and asymptotic normality of the estimates. For our illustration, we shall consider the estimates of the parameters in AR(p)$\mathit{AR}(p)$ and MA(q)$\mathit{MA}(q)$ models for rounded data.     

Empirical likelihood estimation for linear regression models with AR(p) error terms with numerical examples

Linear regression models are useful statistical tools to analyze data sets in different fields. There are several methods to estimate the parameters of a linear regression model. These methods usually perform under normally distributed and uncorrelated errors. If error terms are correlated the Conditional Maximum Likelihood (CML) estimation method under normality assumption is often used to estimate the parameters of interest. The CML estimation method is required a distributional assumption on error terms. However, in practice, such distributional assumptions on error terms may not be plausible. In this paper, we propose to estimate the parameters of a linear regression model with autoregressive error term using Empirical Likelihood (EL) method, which is a distribution free estimation method. A small simulation study is provided to evaluate the performance of the proposed estimation method over the CML method. The results of the simulation study show that the proposed estimators based on EL method are remarkably better than the estimators obtained from CML method in terms of mean squared errors (MSE) and bias in almost all the simulation configurations. These findings are also confirmed by the results of the numerical and real data examples.