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Search Results: 1 - 10 of 425359 matches for " Robin K.S. Hankin "
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Introducing elliptic, an R Package for Elliptic and Modular Functions
Robin K.S. Hankin
Journal of Statistical Software , 2006,
Abstract: This paper introduces the elliptic package of R routines, for numerical calculation of elliptic and related functions. Elliptic functions furnish interesting and instructive examples of many ideas of complex analysis, and the package illustrates these numerically and visually. A statistical application in fluid mechanics is presented.
Introducing multivator : A Multivariate Emulator
Robin K. S. Hankin
Journal of Statistical Software , 2012,
Abstract: A multivariate generalization of the emulator technique described byHankin (2005) is presented in which random multivariate functions may be assessed. In the standard univariate case (Oakley 1999), a Gaussian process, a nite number of observations is made; here, observations of different types are considered. The technique has the property that marginal analysis (that is, considering only a single observation type) reduces exactly to the univariate theory. The associated software is used to analyze datasets from the field of climate change.
A Generalization of the Dirichlet Distribution
Robin K. S. Hankin
Journal of Statistical Software , 2010,
Abstract: This paper discusses a generalization of the Dirichlet distribution, the ‘hyperdirichlet’, in which various types of incomplete observations may be incorporated. It is conjugate to the multinomial distribution when some observations are censored or grouped. The hyperdirichlet R package is introduced and examples given. A number of statistical tests are performed on the example datasets, which are drawn from diverse disciplines including sports statistics, the sociology of climate change, and psephology.
Introducing untb, an R Package For Simulating Ecological Drift Under the Unified Neutral Theory of Biodiversity
Robin K. S. Hankin
Journal of Statistical Software , 2007,
Abstract: The distribution of abundance amongst species with similar ways of life is a classical problem in ecology. The unified neutral theory of biodiversity, due to Hubbell, states that observed population dynamics may be explained on the assumption of per capita equivalence amongst individuals. One can thus dispense with differences between species, and differences between abundant and rare species: all individuals behave alike in respect of their probabilities of reproducing and death. It is a striking fact that such a parsimonious theory results in a non-trivial dominancediversity curve (that is, the simultaneous existence of both abundant and rare species) and even more striking that the theory predicts abundance curves that match observations across a wide range of ecologies. This paper introduces the untb package of R routines, for numerical simulation of ecological drift under the unified neutral theory. A range of visualization, analytical, and simulation tools are provided in the package and these are presented with examples in the paper.
Introducing BACCO, an R Bundle for Bayesian Analysis of Computer Code Output
Robin K. S. Hankin
Journal of Statistical Software , 2005,
Exact Tests for Two-Way Contingency Tables with Structural Zeros
Luke J. West,Robin K. S. Hankin
Journal of Statistical Software , 2008,
Abstract: Fisher's exact test, named for Sir Ronald Aylmer Fisher, tests contingency tables for homogeneity of proportion. This paper discusses a generalization of Fisher's exact test for the case where some of the table entries are constrained to be zero. The resulting test is useful for assessing cases where the null hypothesis of conditional multinomial distribution is suspected to be false. The test is implemented in the form of a new R package, aylmer.
A Study of the Language Learner Strategies Adopted by Nigerian Students
K.S. Ariyo
Pakistan Journal of Social Sciences , 2012, DOI: 10.3923/pjssci.2010.433.436
Abstract: Nigerian students learn and eventually use English as a Second Language (ESL) having acquired at least one of the numerous Nigerian languages as mother tongue (L1). Consequently, learning English in such an ESL environment must take into cognizance some useful strategies that are capable of assisting the English language learner in the Nigerian setting. However, teachers as well as students usually fail to benefit from the numerous opportunities offered by language learner strategies in the course of either language teaching or learning. The written and spoken expressions of Nigerian students in English are generally poor. They obviously need to function adequately well in English since it is the medium of instruction in Nigerian schools. It is on this note that this study aims to attempt a detailed study of the language learner strategies usually adopted in Nigerian schools. It is the position of this study that Nigerian students must be well exposed to all the language learning strategies. They must also be aware that no singular strategy can adequately meet their functional needs.
Enkele opmerkingen met betrekking tot het graf van Herman Boerhaave in de Pieterskerk te Leiden
K.S. Grooss
Tijdschrift voor de Geschiedenis der Geneeskunde, Natuurwetenschappen, Wiskunde en Techniek , 1979,
Cornelis Solingen (1641-1687) en de techniek van het trepaneren
K.S. Grooss
Tijdschrift voor de Geschiedenis der Geneeskunde, Natuurwetenschappen, Wiskunde en Techniek , 1987,
Abstract: C. Solingen and his views on making surgical instruments C. Solingen (1641-1687) may be considered as one of the pioniers in the field of designing a new generation of surgical instruments in the second half of the 17th century. These instruments had a few important properties in common. They were simple and easy to handle, made of a good quality of steel and they lacked the useless curls, characteristic of the 16th and early 17th century surgical instruments. In 1684 Solingen published a book titled Manuale operatien der chirurgie in which he described the instruments he used in various operations. In this book he combined his description with full-size illustrations of his instruments. This gave the reader the opportunity to copy the instruments, use them and test them during the operation. The view of Solingen on form and function of an instrument was based on a long experience at see as a ships-surgeon on several vessels belonging to the Dutch fleet. In this position he had had to work under very difficult circumstances in which one needs instruments, both handy and simple to use. In his own country Solingen's ideas were followed rather quickly, but in France for instance, instrumentmakers kept making instruments with needless ornaments as described by A. Pare and J. Scultetus until far into the 18th century. It was not until the end of the 18th century, that ideas of simplicity, where surgical instruments are concerned, were generally accepted. Solingen bequested his collection of surgical instruments to the university of Leiden and some of them can be identified with the help of the illustrations in his Manuale operatien. They are now in the possession of Museum Boerhaave, Leiden.
K.S. Pendlebury
Akroterion , 2012, DOI: 10.7445/49-0-94
Abstract: The paper judged to be the best student essay submitted to Akroterion by 30 November preceding publication of the volume for that specific year, is published annually as the B X de Wet Essay. The competition, which is sponsored by the Classical Association of South Africa, is open to undergraduate students every year and to Honours students in even-numbered years. A cash prize of R500 is awarded. This essay is named in honour of South African classicist B X de Wet.
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