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Effectively minimizing effective fixed-points [PDF]
Proceedings of the American Mathematical Society, 1971 This note answers an open problem posed by H. Rogers, Jr. on p. 202 of Theory of recursive functions and effective computability by proving the following invariant form of one of his results [op. cit., p. 200, Theorem XIV]: for any fixed-point function n there exists a recursive function g such that if z is an index of an effective operator Ψ
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Regional Business Confidence as Early Indicator of Regional Economic Growth
Managing Global Transitions, 2021 Official sub-national GDP figures in South Africa are usually published with long delays or not at all, i.e. relevant, reliable, and real-time economic data on a provincial and local (municipal) level are often non-existent, causing a significant data ...
Ewert Kleynhans, Clive Coetzee
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A Spatiotemporal Analysis of the COVID‐19 Pandemic in North Africa
GeoHealth, 2022 Spatial panel‐data models are estimated to identify the factors of the prevalence of the coronavirus outbreak in North Africa. Using daily data on the number of cases collected between March 2020 and December 2021, three types of general models are ...
Sami Khedhiri
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Fixing the stimulus-as-fixed-effect fallacy in task fMRI
Wellcome Open Research, 2016 Abstract Most fMRI experiments record the brain’s responses to samples of stimulus materials (e.g., faces or words). Yet the statistical modeling approaches used in fMRI research universally fail to model stimulus variability in a manner that affords population generalization--meaning that researchers’ conclusions ...
Westfall, J, Nichols, T, Yarkoni, T
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Structural gravity and fixed effects [PDF]
Journal of International Economics, 2015 The gravity equation for trade flows is one of the most successful empirical models in economics and has long played a central role in the trade literature (Anderson, 2011). Different approaches to estimate the gravity equation, i.e. reduced-form or more structural, have been proposed.
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Determinants of dissemination of environmental information: an empirical survey
Journal of Business Economics and Management, 2016 The major objective of the present paper is to identify the factors that influence the dissemination of environmental information. In particular, analyst stock recommendation, country level risk, corporate value and environmental performance are surveyed
Grigoris Giannarakis +3 more
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Frontiers in Environmental Science, 2023 China's economic development has entered a new historical stage, and it is crucial to coordinate the linkage between economic development, resource allocation and environmental protection in this new stage.
Shijin Wang, Zhichao Xue
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, 2017 In recent years the massive emergence of multi-dimensional panels has led to an increasing demand for more sophisticated model formulations with respect to the well known two-dimensional ones to address properly the additional heterogeneity in the data.
Balázsi, László +2 more
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Effect of non-genetic factors on longevity traits in Simmental cows [PDF]
Biotechnology in Animal Husbandry, 2019 The effects of fixed non-genetic factors (farm, season of birth, year of birth, total number of lactations) and a continuous non-genetic factor (age at first conception) on the expression and variability of longevity traits such as age at culling, length
Petrović Milun +6 more
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Behaviormetrika, 2006 A fixed effect item response theory (IRT) model is developed for modeling group specific item parameters. Two applications are presented. The first application is that the proposed model can be used to detect whether a response mechanism is ignorable using the splitter item technique.
Fox, Gerardus J.A. +2 more
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