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Search Results: 1 - 10 of 425359 matches for " Robin K. S. Hankin "
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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,
Abstract:
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.
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.
Multivariate Generalizations of the Multiplicative Binomial Distribution: Introducing the MM Package
Pat M. E. Altham,Robin K. S. Hankin
Journal of Statistical Software , 2012,
Abstract: We present two natural generalizations of the multinomial and multivariate binomial distributions, which arise from the multiplicative binomial distribution of Altham (1978). The resulting two distributions are discussed and we introduce an R package, MM, whichincludes associated functionality.
CORH 3 - A Short Duration Non aromatic rice hybrid
Thiyagarajan K,Manonmani S,Robin S,Mohana Sundaram K
Electronic Journal of Plant Breeding , 2009,
Abstract: The new early maturing rice hybrid CORH 3 is a combination of TNAU CMS 2A and CB 87R. This hybrid matures in 115days. The hybrid was found to produce on an average 7.2 tonnes per hectare which was more than 12% higher than thehybrid checks, ADTRH 1 and KRH2, and more than 25% higher than the variety checks, ADT 43 and ADT 39. The hybridproduces good quality rice possessing intermediate amylose, soft gel consistency, and good linear elongation on cooking. Ithas white, non-sticky, non-aromatic rice which tastes good and has been well accepted by the consumers. Besides, the hybridCORH3 is tolerant to Rice Tungro Disease (RTD) and blast. It is also resistant to Green Leaf Hopper (GLH) and tolerant toBrown Plant Hopper (BPH) and White Backed Plant Hopper (WBPH)
Uncertainties in field-line tracing in the magnetosphere. Part II: the complete internal geomagnetic field
D. M. Willis,J. Robin Singh,K. S. C. Freeman
Annales Geophysicae (ANGEO) , 2003,
Abstract: The discussion in the preceding paper is restricted to the uncertainties in magnetic-field-line tracing in the magnetosphere resulting from published standard errors in the spherical harmonic coefficients that define the axisymmetric part of the internal geomagnetic field (i.e. gn0 ± δgn0). Numerical estimates of these uncertainties based on an analytic equation for axisymmetric field lines are in excellent agreement with independent computational estimates based on stepwise numerical integration along magnetic field lines. This comparison confirms the accuracy of the computer program used in the present paper to estimate the uncertainties in magnetic-field-line tracing that arise from published standard errors in the full set of spherical harmonic coefficients, which define the complete (non-axisymmetric) internal geomagnetic field (i.e. gnm ± δgnm and hnm ± δhnm). An algorithm is formulated that greatly reduces the computing time required to estimate these uncertainties in magnetic-field-line tracing. The validity of this algorithm is checked numerically for both the axisymmetric part of the internal geomagnetic field in the general case (1 ≤ n ≤ 10) and the complete internal geomagnetic field in a restrictive case (0 ≤ m ≤ n, 1 ≤ n ≤ 3). On this basis it is assumed that the algorithm can be used with confidence in those cases for which the computing time would otherwise be prohibitively long. For the complete internal geomagnetic field, the maximum characteristic uncertainty in the geocentric distance of a field line that crosses the geomagnetic equator at a nominal dipolar distance of 2 RE is typically 100 km. The corresponding characteristic uncertainty for a field line that crosses the geomagnetic equator at a nominal dipolar distance of 6 RE is typically 500 km. Histograms and scatter plots showing the characteristic uncertainties associated with magnetic-field-line tracing in the magnetosphere are presented for a range of illustrative examples. Finally, estimates are given for the maximum uncertainties in the locations of the conjugate points of selected geophysical observatories. Numerical estimates of the uncertainties in magnetic-field-line tracing in the magnetosphere, including the associated uncertainties in the locations of the conjugate points of geophysical observatories, should be regarded as "first approximations'' in the sense that these estimates are only as accurate as the published standard errors in the full set of spherical harmonic coefficients. As in the preceding paper, however, all computational techniques developed in this
Heterosis under aerobic condition in hybrid Rice
K Amudha, K. Thiyagarajan, S. Robin, Silvas Jeba Kumar Prince, R. Poornima and K.K. Suji
Electronic Journal of Plant Breeding , 2010,
Abstract: An experiment was undertaken to identify heterotic rice hybrids for aerobic condition based on physiological and rootcharacters associated with water stress tolerance in rice. Panicle harvest index, a substitute for spikelet fertility is used as asecondary trait in the selection of drought tolerant genotypes. Deep roots are required to explore the soil profile foreffectively absorbing water at deeper layers. A cultivar which partitions more of its dry weight in root can explore more soilvolume for extracting water and thus can effectively sustain drought. Four hybrids viz., IR 68885A / IR 73718-3-1-3-3, IR67684A / CT-6510-24-1- 2, IR 70369A / IR 73718-3-1-3-3 and IR 70372A/ PSBRC 80 exhibited heterotic vigour for yieldand maximum number of yield components and showed better adaptability to aerobic conditions. These hybrids can becommercially exploited under aerobic condition.
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