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61.
Does local Federal regulation respond to the preferences of local Congressional representatives? For example, do Republican Congressmen reduce local enforcement of Clean Air laws in their districts? We use facility‐level panel data on Clean Air Act inspections over 1989–2005 to study the causal effect of a Congressman's party affiliation on local enforcement. Random assignment of electoral outcomes is obtained with a Regression Discontinuity design. We find that new Republican (vs. Democratic) Representatives significantly depress inspection rates for local polluting facilities in the first year after their election. (JEL D73, Q52, Q53) 相似文献
62.
Chirp signals are quite common in many natural and man-made systems such as audio signals, sonar, and radar. Estimation of the unknown parameters of a signal is a fundamental problem in statistical signal processing. Recently, Kundu and Nandi [Parameter estimation of chirp signals in presence of stationary noise. Stat Sin. 2008;75:187–201] studied the asymptotic properties of least squares estimators (LSEs) of the unknown parameters of a simple chirp signal model under the assumption of stationary noise. In this paper, we propose periodogram-type estimators called the approximate least squares estimators (ALSEs) to estimate the unknown parameters and study the asymptotic properties of these estimators under the same error assumptions. It is observed that the ALSEs are strongly consistent and asymptotically equivalent to the LSEs. Similar to the periodogram estimators, these estimators can also be used as initial guesses to find the LSEs of the unknown parameters. We perform some numerical simulations to see the performance of the proposed estimators and compare them with the LSEs and the estimators proposed by Lahiri et al. [Efficient algorithm for estimating the parameters of two dimensional chirp signal. Sankhya B. 2013;75(1):65–89]. We have analysed two real data sets for illustrative purposes. 相似文献
63.
Sharmishtha Mitra 《Journal of applied statistics》2014,41(4):853-878
In this paper, we consider the problem of estimating the number of components of a superimposed nonlinear sinusoids model of a signal in the presence of additive noise. We propose and provide a detailed empirical comparison of robust methods for estimation of the number of components. The proposed methods, which are robust modifications of the commonly used information theoretic criteria, are based on various M-estimator approaches and are robust with respect to outliers present in the data and heavy-tailed noise. The proposed methods are compared with the usual non-robust methods through extensive simulations under varied model scenarios. We also present real signal analysis of two speech signals to show the usefulness of the proposed methodology. 相似文献
64.
In this article, we propose an interesting approach for testing exponentiality against NBAFR alternatives. A measure of deviation from exponentiality has been derived on the basis of an inequality which we have proved. A test statistic has been constructed using density estimators and its asymptotic normality established. The consistency of the said test is also proved. 相似文献
65.
66.
The maximum likelihood estimates (MLEs) of the parameters of a two-parameter lognormal distribution with left truncation and right censoring are developed through the Expectation Maximization (EM) algorithm. For comparative purpose, the MLEs are also obtained by the Newton–Raphson method. The asymptotic variance-covariance matrix of the MLEs is obtained by using the missing information principle, under the EM framework. Then, using asymptotic normality of the MLEs, asymptotic confidence intervals for the parameters are constructed. Asymptotic confidence intervals are also obtained using the estimated variance of the MLEs by the observed information matrix, and by using parametric bootstrap technique. Different confidence intervals are then compared in terms of coverage probabilities, through a Monte Carlo simulation study. A prediction problem concerning the future lifetime of a right censored unit is also considered. A numerical example is given to illustrate all the inferential methods developed here. 相似文献
67.
In this article, we characterize heterogenous commodities allocation problems where an efficient rule can be implemented in dominant strategies with balanced transfers. We show that the class of such problems is non-trivial and that the associated difference domain is one-dimensional. If the domain satisfies convexity, there exists a permutation of the objects for which the associated difference domain is a straight line passing through the origin with positive slope. An interesting feature of the domains is that at most two orderings of the commodities are permissible and, in particular, one ordering must be the reverse of the other. 相似文献
68.
This article investigates the nature of paths in the standard neoclassical aggregative model of economic growth that are maximal according to the Suppes–Sen grading principle. This is accomplished by relating such paths to paths which are utilitarian maximal when an increasing (but not necessarily concave) utility function evaluates each period’s consumption. Dynamic properties of Suppes–Sen maximal paths, which lie entirely above or entirely below the golden-rule, are analyzed. An example is presented in which an explicit form of a consumption function is described, which generates only Suppes–Sen maximal paths. This consumption function is shown to generate consumption cycles, and violate the Pigou–Dalton transfer principle. 相似文献
69.
Diditi Mitra 《Sociological Forum》2020,35(4):1346-1353
In this introductory essay, I reflect on the connection between pedagogy and activism and introduce the three contributors to this special section on the topic. More specifically, I chart key points in the history of sociology in the West asking readers to consider whether sociology has ever been value-free. In the process, I invoke sociologists who thought it essential for integration of sociological thought and practice (albeit not necessarily in the form of activism), ponder the meaning of science and think about the meaning of an education in sociology. As part of the discussion, I also present my position on sociology, pedagogy, and activism. 相似文献
70.
Mitra Rastegar 《International Feminist Journal of Politics》2013,15(4):455-474
Focusing on the case of Islam in post-9/11 United States, this article highlights the particularity of how US secularism is enacted by the state. In much sociological theory, the United States has been understood to be a neutral and non-interfering state with regard to religion, thereby fostering a pluralist religious context of free consumer choice. Some Muslim reformists have argued that this context makes the US highly fertile ground upon which to reform Islam and to improve women's status in Islam. This article argues that, in the context of the US-led ‘war on terror’, the government has drawn on and amplified this discourse in the service of producing a representation of the US as tolerant, while also seeking to promote a concept of ‘true’ Islam and produce patriotic Muslim citizens. At the center of this discourse are contested portrayals of Muslim women as symbolic of a modern and liberated Islam that is uniquely ‘American’ and opposed to other presumably oppressive Islams. While this context may in fact promote the reform of Islam, it does so with state involvement rather than as a result of state neutrality. 相似文献