نتایج جستجو برای: random sample size

تعداد نتایج: 1134962  

2017
Marie Ward Eilish McAuliffe Éidín Ní Shé Ann Duffy Una Geary Una Cunningham Catherine Holland Nick McDonald Karen Egan Christian Korpos

INTRODUCTION Healthcare organisations have a responsibility for ensuring that the governance of workplace settings creates a culture that supports good professional practice. Encouraging such a culture needs to start from an understanding of the factors that make it difficult for health professionals to raise issues of concern in relation to patient safety. The focus of this study is to determi...

Journal: :Pacific Symposium on Biocomputing. Pacific Symposium on Biocomputing 2003
Lonnie Chrisman Pat Langley Stephen D. Bay

Biological data can be scarce and costly to obtain. The small number of samples available typically limits statistical power and makes reliable inference of causal relations extremely difficult. However, we argue that statistical power can be increased substantially by incorporating prior knowledge and data from diverse sources. We present a Bayesian framework that combines information from dif...

2014
J Bowden A Mander

In this paper, we review the adaptive design methodology of Li et al. (Biostatistics 3:277-287) for two-stage trials with mid-trial sample size adjustment. We argue that it is closer in principle to a group sequential design, in spite of its obvious adaptive element. Several extensions are proposed that aim to make it even more attractive and transparent alternative to a standard (fixed sample ...

Journal: :Acta psychiatrica Scandinavica 2000
A Barbato B D'Avanzo

OBJECTIVE To update evidence from studies on family intervention in schizophrenia looking carefully at methodological issues. METHOD Twenty-five studies were reviewed, using specific outcome criteria, and computing effect sizes whenever possible. RESULTS Effect on relapse is relatively well assessed, although differences emerged particularly in comparison with poor control treatments and di...

Journal: :Journal of clinical and experimental neuropsychology 2004
Paul J Yoder Jennifer Urbano Blackford Niels G Waller Geunyoung Kim

This study examined the relative family-wise error (FWE) rate and statistical power of multivariate permutation tests (MPTs), Bonferroni-adjusted alpha, and uncorrected-alpha tests of significance for bivariate associations. Although there are many previous applications of MPTs, this is the first to apply it to testing bivariate associations. Electrocortical studies were selected as an example ...

Journal: :Journal of computational chemistry 2004
F Marty Ytreberg Daniel M Zuckerman

A promising method for calculating free energy differences DeltaF is to generate nonequilibrium data via "fast-growth" simulations or by experiments--and then use Jarzynski's equality. However, a difficulty with using Jarzynski's equality is that DeltaF estimates converge very slowly and unreliably due to the nonlinear nature of the calculation--thus requiring large, costly data sets. The purpo...

2016
Guan-Rong Huang J. C. Huang W. Y. Tsai

In crystalline metals at small scales, the dislocation density will be increased by stochastic events of dislocation network, leading to a universal power law for various material structures. In this work, we develop a model obeyed by a probability distribution of dislocation density to describe the dislocation formation in terms of a chain reaction. The leading order terms of steady-state of p...

2016
Sachiyo Yoshida Igor Rudan Simon Cousens

INTRODUCTION Crowdsourcing has become an increasingly important tool to address many problems - from government elections in democracies, stock market prices, to modern online tools such as TripAdvisor or Internet Movie Database (IMDB). The CHNRI method (the acronym for the Child Health and Nutrition Research Initiative) for setting health research priorities has crowdsourcing as the major comp...

2015
Myriam Blanchin Alice Guilleux Bastien Perrot Angélique Bonnaud-Antignac Jean-Benoit Hardouin Véronique Sébille

BACKGROUND Patient-reported outcomes (PRO) are important as endpoints in clinical trials and epidemiological studies. Guidelines for the development of PRO instruments and analysis of PRO data have emphasized the need to report methods used for sample size planning. The Raschpower procedure has been proposed for sample size and power determination for the comparison of PROs in cross-sectional s...

2011
Michael A Rotondi

Description This package contains basic tools for the purpose of sample size estimation in cluster (group) randomized trials. The package contains traditional power-based methods, empirical smoothing (Rotondi and Donner, 2009), and updated meta-analysis techniques (Rotondi and Donner, 2011).

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