Zobrazeno 1 - 10
of 22
pro vyhledávání: '"Helmuth Zimmermann"'
Autor:
Volker W. Rahlfs, Helmuth Zimmermann
Publikováno v:
Frontiers in Neurology, Vol 12 (2021)
Introduction: The Mean Vertigo Score (MVS) is a composite score for defining the burden of disease of patients suffering from vestibular disorders. It has been used in clinical research for about 30 years. This study investigates discriminant validit
Externí odkaz:
https://doaj.org/article/8541ae021b86498b9f3b532a3fd00b49
Autor:
Volker W. Rahlfs, Helmuth Zimmermann
Publikováno v:
Biometrical Journal. Biometrische Zeitschrift
The standardized mean difference is a well‐known effect size measure for continuous, normally distributed data. In this paper we present a general basis for important other distribution families. As a general concept, usable for every distribution
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::606c6b01a3eed23cce994938c65c347f
https://doi.org/10.1002/bimj.201800107
https://doi.org/10.1002/bimj.201800107
Autor:
Helmuth Zimmermann, Volker W. Rahlfs
Publikováno v:
Statistical Methods in Medical Research. 23:107-110
A well-known effect size measure in evidence-based medicine is the number-needed-to-treat (NNT) in order to get one more responder or one more patient with improvement. It is defined as the reciprocal of the simple risk difference of the two groups b
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b735f699a8b3134d73386f79f8e04bbc
https://doi.org/10.1177/0962280212469202
https://doi.org/10.1177/0962280212469202
Autor:
Helmuth Zimmermann, Hans Burzlaff
Publikováno v:
Acta Crystallographica Section A Foundations of Crystallography. 65:456-465
An open-ended classification scheme for crystal structures based on Wyckoff sets and affine normalizer groups is proposed. It is free of metrical and geometrical considerations. All structures of one structure type belong to the same symmetry class.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e5baf9b47760f24f59b5068da05c3782
https://doi.org/10.1107/s0108767309030116
https://doi.org/10.1107/s0108767309030116
Publikováno v:
Zeitschrift für Kristallographie - Crystalline Materials. 221:673-680
Using for a one-dimensional centrosymmetric structure of m equal point scatterers an m-dimensional coordinate parameter space P m and the (n – 1) independent ratios q(h, k) = [I′(h)/I′(k)]1/2 = g′(h)/g′(k) of n > 1 structure amplitudes obse
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::716f8a9d9416d7293d7d27779c980170
https://doi.org/10.1524/zkri.2006.221.10.673
https://doi.org/10.1524/zkri.2006.221.10.673
Publikováno v:
Zeitschrift für Kristallographie - Crystalline Materials. 220:643-656
A concept is presented for determining a one-dimensional structure ofmindependent point scatterers by mapping into anm-dimensional spacePmat leastmobservations as (m– 1)-dimensional so-called “isosurfaces” defined bys(h) ·g(h) org(h) alone, wh
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::35d66be53e536c78df67148b574d2d27
https://doi.org/10.1524/zkri.220.7.643.67099
https://doi.org/10.1524/zkri.220.7.643.67099
Publikováno v:
Stroke. 45(2)
Many articles in Stroke have considered good statistical practice for adequate planning and high-power analysis for stroke trials. They have discussed which test may be adequate and powerful, proposals for an effect size measure, and proposals for de
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::447e2066c56898c43adb266370e690f5
https://pubmed.ncbi.nlm.nih.gov/24370754
https://pubmed.ncbi.nlm.nih.gov/24370754
Autor:
Volker W. Rahlfs, Helmuth Zimmermann
Publikováno v:
Computational Statistics & Data Analysis. 20:101-110
The case of the Friedman analysis is discussed with reference to the major statistics packages. A computer program is described which is able to analyse datasets with missing observations which may be either accidental or planned as in Durbin designs
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cedb1b3351ec4b8bd9e40fd429c28aed
https://doi.org/10.1016/0167-9473(95)90171-x
https://doi.org/10.1016/0167-9473(95)90171-x
Autor:
Karl F. Fischer, Helmuth Zimmermann
Publikováno v:
Acta crystallographica. Section A, Foundations of crystallography. 65(Pt 6)
The parameter-space concept for solving crystal structures from reflection amplitudes (without employing or searching for their phases) is described on a theoretically oriented basis. Emphasis is placed on the principles of the method, on selecting o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a0a9b9104c89e032eeadba5822b1574e
https://pubmed.ncbi.nlm.nih.gov/19844029
https://pubmed.ncbi.nlm.nih.gov/19844029
Publikováno v:
Croatica Chemica Acta
Volume 81
Issue 2
Volume 81
Issue 2
Determination of a crystal structure without Fourier calculation of the scattering density (thus also avoiding the phase problem) is achieved in a fractional coordinate parameter space of dimension 3m where m is the number of independent atoms, reduc
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od_______951::5dc7c60fad9d2a4854a6c9cd623a0953
https://hrcak.srce.hr/file/44706
https://hrcak.srce.hr/file/44706