3,726 research outputs found
Goodness-of-fit tests for a heavy tailed distribution
For testing whether a distribution function is heavy tailed, we study theKolmogorov test, Berk-Jones test, score test and their integratedversions. A comparison is conducted via Bahadur efficiency and simulations.The score test and the integrated score test show the best performance.Although the Berk-Jones test is more powerful than the Kolmogorov-Smirnovtest, this does not hold true for their integrated versions; this differsfrom results in \\citet{EinmahlMckeague2003}, which shows the difference ofBerk-Jones test in testing distributions and tails.Bahadur efficiency;heavy tail;tail index
Goodness-of-fit tests for a heavy tailed distribution
For testing whether a distribution function is heavy tailed, we study the
Kolmogorov test, Berk-Jones test, score test and their integrated
versions. A comparison is conducted via Bahadur efficiency and simulations.
The score test and the integrated score test show the best performance.
Although the Berk-Jones test is more powerful than the Kolmogorov-Smirnov
test, this does not hold true for their integrated versions; this differs
from results in \\citet{EinmahlMckeague2003}, which shows the difference of
Berk-Jones test in testing distributions and tails
A systematic review and critical appraisal of quality indicators to assess optimal palliative care for older people with dementia
© The Author(s) 2019Background: A challenge for commissioners and providers of end-of-life care in dementia is to translate recommendations for good or effective care into quality indicators that inform service development and evaluation. Aim: To identify and critically evaluate quality indicators for end-of-life care in dementia. Results: We found 8657 references, after de-duplication. In all, 19 publications describing 10 new and 3 updated sets of indicators were included in this review. Ultimately, 246 individual indicators were identified as being relevant to dementia end-of-life care and mapped against EAPC guidelines. Conclusions: We systematically derived and assessed a set of quality indicators using a robust framework that provides clear definitions of aspects of palliative care, which are dementia specific, and strengthens the theoretical underpinning of new complex interventions in end-of-life care in dementia.Peer reviewedFinal Published versio
Polyimide
The invention relates to a polyimide substantially built up from monomeric units of 3,3',4,4'-benzophenonetetracarboxylic dianhydride and monomeric units of a primary aliphatic diamine. The polyimide according to the invention is characterized in that the primary aliphatic diamine is substantially 1,4-diaminobutane. The thermal stability of the polyimide according to the invention has surprisingly been found to be very good. Owing to this very good thermal stability, the polyimides according to the invention can very well be processed at - relatively - high processing temperatures without any appreciable thermal degradation of the polyimide. As a result, the polyimides processing potential has increased considerably. Also, articles made of the polyimides according to the invention can be used at significantly higher temperatures. Said articles have very good mechanical properties. Articles containing a polyimide are suited for being used in the most diverse applications. Application within a large number of industries may be thought of, such as the electrical, electronic and automotive industries. In space travel, too, the interest in such polyimides is great
Creative Movement Dance Class for Adolescents with Autism Spectrum Disorder
Objective: The objective of this phenomenological study was to identify how an occupational therapy developed Creative Movement Dance Class (CMDC) addresses social interaction skills in adolescents with Autism Spectrum Disorder (ASD).
Method: Interviews were conducted with a Certified Occupational Therapist Assistant (COTA), Occupational Therapist (OT), ballet instructor, student intern, teacher, and an aide that were directly involved with the CMDC.
Results: Three themes were identified. The first theme, structure of the class, consisted of eight sub-themes including opportunity to practice, fulfilling sensory needs, the Just Right Challenge, classroom support, classroom expectations, interprofessional collaboration, themes, and format of the class. The second theme, engagement techniques, consisted of five sub-themes including peer modeling, turn taking, use of props, making choices, and coping skills. The third theme, teaching techniques, consisted of four sub-themes including instructors body positioning, verbal/physical/visual cues, instructor modeling, and communication (sentence strips, Personal Exchange Communication System [PECS], and core vocabulary).
Conclusion: An occupational therapy developed CMDC addresses social interaction skills through the structure of the class, engagement techniques, and teaching techniques. Many of the techniques identified are supported in the literature for ASD and creative movement. Several novel techniques were found that may prove to be effective in addressing social interaction skills for adolescents with ASD through a CMDC
Radio Frequency Models of Novae in eruption. I. The Free-Free Process in Bipolar Morphologies
Observations of novae at radio frequencies provide us with a measure of the
total ejected mass, density profile and kinetic energy of a nova eruption. The
radio emission is typically well characterized by the free-free emission
process. Most models to date have assumed spherical symmetry for the eruption,
although it has been known for as long as there have been radio observations of
these systems, that spherical eruptions are to simplistic a geometry. In this
paper, we build bipolar models of the nova eruption, assuming the free-free
process, and show the effects of varying different parameters on the radio
light curves. The parameters considered include the ratio of the minor- to
major-axis, the inclination angle and shell thickness (further parameters are
provided in the appendix). We also show the uncertainty introduced when fitting
spherical model synthetic light curves to bipolar model synthetic light curves.
We find that the optically thick phase rises with the same power law () for both the spherical and bipolar models. In the bipolar case
there is a "plateau" phase -- depending on the thickness of the shell as well
as the ratio of the minor- to major-axis -- before the final decline, that
follows the same power law () as in the spherical case.
Finally, fitting spherical models to the bipolar model synthetic light curves
requires, in the worst case scenario, doubling the ejected mass, more than
halving the electron temperature and reducing the shell thickness by nearly a
factor of 10. This implies that in some systems we have been over predicting
the ejected masses and under predicting the electron temperature of the ejecta.Comment: 9 pages, 6 figures, accepted for publication in ApJ, accompanying
movie to figure 3 available at
http://www.ast.uct.ac.za/~valerio/papers/radioI
Comparison between two methods of solution of coupled equations for low-energy scattering
Cross sections from low-energy neutron-nucleus scattering have been evaluated
using a coupled channel theory of scattering. Both a coordinate-space and a
momentum-space formalism of that coupled-channel theory are considered.A simple
rotational model of the channel interaction potentials is used to find results
using two relevant codes, ECIS97 and MCAS, so that they may be compared. The
very same model is then used in the MCAS approach to quantify the changes that
occur when allowance is made for effects of the Pauli principle.Comment: 6 pages, 3 figure
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