Generalized method of moments for an extended gamma process

In reliability theory, a widely used process to model the phenomena of the cumulative deterioration of a system over time is the standard gamma process (SGP). Based on several restrictions, such as a constant variance-to-mean ratio, this process is not always a suitable choice to describe the deterioration. A way to overcome these restrictions is to use an extended version of the gamma process introduced by Cinlar (1980), which is characterized by shape and scale functions. In this article, the aim is to propose statistical methods to estimate the unknown parameters of parametric forms of the shape and scale functions. We here develop two generalized methods of moments (Hansen 1982 Hansen, L. P. 1982. Large sample properties of generalized method of moments estimators. Econometrica 50 (4):1029–54.[Crossref], [Web of Science ®] , [Google Scholar]), based either on the moments or on the Laplace transform of an extended gamma process. Asymptotic properties are provided and a Wald-type test is derived, which allows to test SGPs against extended ones with a specific parametric shape function. Also, the performance of the proposed estimation methods is illustrated on simulated and real data.     

The impact of forest to urban land conversion on streamflow, total nitrogen, total phosphorus, and total organic carbon inputs to the converse reservoir, Southern Alabama, USA

High total organic carbon (TOC) concentrations in Converse Reservoir, a water source for Mobile, Alabama, have concerned water treatment officials due to the potential for disinfection byproduct (DBP) formation. TOC reacts with chlorine during drinking water treatment to form DBPs. This study evaluated how increased urbanization can alter watershed-derived total nitrogen (TN), total phosphorus (TP) and TOC inputs to the Converse Reservoir. Converse Watershed, on the urban fringe of Mobile, is projected to undergo urbanization increasing watershed urban land from 3% in 1992 to 22% urban land by 2020. A pre-urbanization scenario using 1992 land cover was coupled with 2020 projections of land use. The Loading Simulation Program C++ watershed model was used to evaluate changes in nutrient concentrations (mg L^?1) and loads (kg) to Converse Reservoir. Urban and suburban growth of 52 km² simulated from 1991 to 2005 (15 year) caused overall TN and TP loads to increase by 109 and 62%, respectively. Simulated urban growth generally increased monthly flows by 15%, but resulted in lower streamflows (2.9%) during drought months. Results indicate that post-urbanization median TN and TP concentrations were 59 and 66% higher than corresponding pre-urbanization concentrations, whereas TOC concentrations were 16% lower. An increase in urban flow caused TOC loads to increase by 26%, despite lower post-urbanization TOC concentrations.     

Hegemonic Masculinity and Globalization: ‘Transnational Business Masculinities’ and Beyond

In recent years masculinity studies writers, in particular R. W. Connell, have focused on the relationship between globalization and ‘hegemonic’ forms of masculinity. This paper provides an assessment of this scholarship and argues that whilst Connell and others have usefully identified the gendered nature of globalization, masculinity scholars have also provided a somewhat limiting account of the global hegemonic role of a monolithic top-down ‘transnational business masculinity’. By contrast, we suggest a demassification of this notion of hegemonic masculinity. Such a demassification enables the opening up of a dialogue between masculinity studies and feminist and other critical globalization scholars, allowing for a more nuanced analysis that can attend to both the unevenness of globalization in different settings and more detailed awareness of interactions between global and local/cultural/state imperatives. Our aim here is to move away from conceptualizations of globalization and hegemonic masculinity that are exceptionally top-down towards an analysis of the contested and shifting nature of gender identity at the global as well as the local level, to highlight the ways in which different hegemonic masculinities are negotiated, and even resisted. We argue that by understanding ‘transnational business masculinity’ as a discursive ideal that legitimates the workings of global capitalism, there is scope for a greater level of engagement between critical globalization scholarship and gender studies. This might also open the door to an account of globalization that entails more detailed reference to women and femininities.

En años recientes, los escritores sobre Los Estudios de la Masculinidad, y en particular R.W. Connell, se han enfocado en la relación entre la globalización y las formas ‘hegemónicas’ de la masculinidad. Este artículo proporciona una evaluación de esta beca y sostiene que mientras Connell y otros han identificado de manera útil la naturaleza del género de la globalización, los académicos sobre la masculinidad también suministraron un reporte de cierta manera limitado, sobre el rol hegemónico global monolítico del más alto al más bajo, de ‘una masculinidad en los negocios transnacionales’. Por el contrario, nosotros sugerimos una desmasificación de esta noción de masculinidad hegemónica. Tal desmasificación hace posible la apertura de un diálogo entre Los Estudios de la Masculinidad y de Feministas y otros académicos críticos de la globalización, permitiendo un análisis más matizado que puede acudir tanto a la disparidad de la globalización en diferentes escenarios como a una mayor conciencia detallada sobre las interacciones entre los imperativos locales/culturales/estatales. Nuestra meta es separarnos de las conceptualizaciones de la globalización y de la masculinidad hegemónica que son excepcionalmente jerárquicas hacia un análisis de los controvertidos y trasladar la naturaleza de la identidad del género tanto a nivel global como al local, para resaltar las formas como las masculinidades hegemónicas diferentes han negociado, e incluso resistido. Sostenemos que al entender ‘la masculinidad en los negocios transnacionales’ como un ideal discursivo que legitimiza el funcionamiento del capitalismo global, existe un propósito para un nivel mayor de participación entre la investigación crítica de la globalización y los estudios del género. Esto también puede abrir la puerta a un informe de globalización que conlleve una referencia más detallada de mujeres y feminidades.

     

A Note on Ergodic Processes Prediction via Estimation of the Conditional Mode Function

We establish the uniform almost-sure convergence of a kernel estimate of the conditional density for an ergodic process. A useful application to the prediction of the ergodic process via the conditional mode function is also given.     

On regression-based tests for persistence in logarithmic volatility models

Building on the work of Pantula (1986), this paper discusses how the hypothesis of conditional variance nonstationarity in the logarithmic family of generalized autoregressive conditional heteroskedasticity (GARCH) and stochastic volatility processes may be tested using regression-based tests. The latter are easy to implement, have well-defined large-sample distributions, and are less sensitive to structural changes than tests based on the quasimaximum likelihood estimator.     

Attitudes as an Expression of Knowledge and “Political Anchoring”: The Case of Nuclear Power in the United Kingdom

Attitudes toward the use of nuclear energy pose fundamental issues in the political debate about how to meet future energy needs. Development of new nuclear power facilities faces significant opposition both from knowledgeable individuals who display an understanding of the risks attached to various forms of power generation and those who follow strict politically based ideological dogmas. This article employs data from a 2005 Eurobarometer survey of UK citizens to examine the influence of both political preferences and knowledge in explaining support of nuclear power. Findings reveal that attitudes about nuclear power are highly politically motivated while the influence of knowledge about radioactive waste is dependent upon beliefs about the consequences of nuclear energy use. Perceptions of being informed about radioactive waste and trust in sources providing information about radioactive waste management also predict attitudes toward nuclear power generation.     

A theory of instrumental and existential rational decisions: Smith,Weber, Mauss,Tönnies after Martin Buber

This paper proffers a dialogical theory of decision-making: decision-makers (DMs) are engaged in two modes of rational decisions, instrumental and existential. Instrumental rational decisions take place when the DM views the self externally to the objects, whether goods or animate beings. Existential rational decisions take place when the DM views the self in union with such objects. While the dialogical theory differs from Max Weber’s distinction between two kinds of rationality, it follows Martin Buber’s philosophical anthropology. The paper expounds the ramifications of the dialogical theory in understanding structures of exchange considering assessments of diverse thinkers.