Search results for "statistical [methods]"
showing 10 items of 1664 documents
Statistical modelling of non-stationary processes of atmospheric pollution from natural sources: example of birch pollen
2016
Abstract A statistical model for predicting daily mean pollen concentrations during the flowering season is constructed and its parameterization and application to birch pollen in Riga (Latvia) are discussed. The model involves several steps of transformations of both meteorological data and pollen observations, aiming at a normally distributed homogeneous stationary dataset with linearized dependencies between the transformed meteorological predictors and pollen concentrations. The data transformation includes normalization of daily mean birch pollen concentrations, a switch of the independent axis from time to heat sum, a projection of governing parameters to pollen concentrations, and a …
Gender differences in axis I and axis II comorbidity in patients with borderline personality disorder.
2008
<i>Background/Aims:</i> Differences in the clinical presentation of men and women with borderline personality disorder (BPD) are of potential interest for investigations into the neurobiology, genetics, natural history, and treatment response of BPD. The purpose of this study was to investigate gender differences in axis I and axis II comorbidity and in diagnostic criteria in BPD patients. <i>Methods:</i> 110 women and 49 men with BPD were assessed with the computer-based version of the Munich-Composite International Diagnostic Interview and the Structured Clinical Interview for DSM-IV Personality Disorders. Gender differences were investigated for the following outc…
Don't change a winning horse
2005
IntroductionThere is surprising excitement about the adequacy andfuture of the somatoform disorders (SFDs) as a circum-scribed diagnostic group [1–4]. Some authors wish to takethe forthcoming fifth revision of the Diagnostic andStatistical Manual (DSM) as a welcome occasion to removean unloved diagnostic term. However, eliminating the SFDswould devaluate the progress of research and clinicalpractice made during the past 25 years. It would lead toinsecurity and confusion in an interdisciplinary field whereclear terminology and common understanding is of highvalue. This contribution attempts to summarize some of themajor reasons why DSM-V should continue with the SFDs.Some suggestions will be…
Why DSM-III was right to introduce the concept of somatoform disorders.
2005
From the Psychological Institute, University of Mainz; and the Psychological Institute, University of Marburg, Marburg, Germany. Address correspondence and reprint requests to Dr. Hiller, Psychological Institute, University of Mainz, Staudingerweg 9, D-55099 Mainz, Germany; hiller@mail.uni-mainz.de (e-mail). Copyright 2005 The Academy of Psychosomatic Medicine. An interesting debate about the adequacy of the somatoform disorders as a diagnostic and clinical concept has begun. The debate is stimulated by the announcement of APA’s preparation of DSM-V, which is likely to follow DSM-IV as the world’s most influential classification system for defining the terminology and diagnostic definitions…
Were the chaotic ELMs in TCV the result of an ARMA process?
2004
The results of a previous paper claiming the demonstration that edge localized mode (ELM) dynamics on TCV are chaotic in a number of cases has recently been called into question, because the statistical test employed was found to also identify linear auto regressive—moving average (ARMA) models as chaotic. The TCV ELM data has therefore been re-examined with an improved method that is able to make this distinction, and the ARMA model is found to be an inappropriate description of the dynamics on TCV. The hypothesis that ELM dynamics are chaotic on TCV in a number of cases is therefore still favoured.
Spatial quantum noise interferometry in expanding ultracold atom clouds
2005
It is ten years since the exotic form of matter known as a Bose–Einstein condensate was first created. It was the birth of ultra-low-temperature physics, and practitioners gathered last month in Banff, Canada, to celebrate and discuss the latest news, as Karen Fox reports. And this week a new development that could have a major impact in the field is announced. In the 1950s, Hanbury Brown and Twiss showed that it is possible to measure angular sizes of astronomical radio sources from correlations of signal intensities in independent detectors. ‘HBT interferometry’ later became a key technique in quantum optics, and now it has been harnessed to identify a quantum phase of ultracold bosonic a…
Implementing the three-particle quantization condition including higher partial waves
2019
We present an implementation of the relativistic three-particle quantization condition including both $s$- and $d$-wave two-particle channels. For this, we develop a systematic expansion about threshold of the three-particle divergence-free K matrix, $\mathcal{K}_{\mathrm{df,3}}$, which is a generalization of the effective range expansion of the two-particle K matrix, $\mathcal{K}_2$. Relativistic invariance plays an important role in this expansion. We find that $d$-wave two-particle channels enter first at quadratic order. We explain how to implement the resulting multichannel quantization condition, and present several examples of its application. We derive the leading dependence of the …
Model nuclear energy density functionals derived from ab initio calculations
2020
We present the first application of a new approach, proposed in [Journal of Physics G: Nuclear and Particle Physics, 43, 04LT01 (2016)] to derive coupling constants of the Skyrme energy density functional (EDF) from ab initio Hamiltonian. By perturbing the ab initio Hamiltonian with several functional generators defining the Skyrme EDF, we create a set of metadata that is then used to constrain the coupling constants of the functional. We use statistical analysis to obtain such an ab initio-equivalent Skyrme EDF. We find that the resulting functional describes properties of atomic nuclei and infinite nuclear matter quite poorly. This may point out to the necessity of building up the ab init…
QCD Challenges from pp to A-A Collisions
2020
This paper is a write-up of the ideas that were presented, developed and discussed at the third International Workshop on QCD Challenges from pp to A-A, which took place in August 2019 in Lund, Sweden. The goal of the workshop was to focus on some of the open questions in the field and try to come up with concrete suggestions for how to make progress on both the experimental and theoretical sides. The paper gives a brief introduction to each topic and then summarizes the primary results.
Fragmentation in the ϕ3 theory and the LPHD hypothesis
2015
We present analytic solution of the Dokshitzer-Gribov-Lipatov-Altarelli-Parisi (DGLAP) equation at leading order (LO) in the phi^3 theory in 6 space-time dimensions. If the phi^3 model was the theory of strong interactions, the obtained solution would describe the distribution of partons in a jet. We point out that the local parton-hadron duality (LPHD) conjecture does not work in this hypothetical situation. That is, treatment of hadronisation of shower partons is essential for the description of hadron distributions in jets stemming from proton-proton (pp) collisions at \sqrt{s} = 7 TeV and from electron-positron (e+e-) annihilations at various collision energies. We use a statistical mod…