نتایج جستجو برای: combination sample

تعداد نتایج: 771841  

Journal: :British heart journal 1978
T B Dick M C Stone

A random sample of 283 men and 250 women between the ages of 30 and 69 years has been investigated for the three coronary risk factors-smoking, hyperlipoproteinaemia, and hypertension, and 146 men and 87 women with ischaemic heart disease have undergone a similar investigation. Smoking and hyperlipoproteinaemia are significantly more common in both men and women in ischaemic heart disease group...

2009
F. Rublík

The exact critical points for selected sample sizes and significance levels are tabulated for the two-sample test statistic which is a combination of the Wilcoxon and the Mood test statistic. This statistic serves for testing the null hypothesis that two sampled populations have the same location and scale parameters.

2014
Maoxun Yang Bin Zhao Qiaoli Lv Wan Xie Yaoguang Liang

Through the single factor experiment, this paper explore the best sample amount of phillyrin separation and preparation, using a combination method of positive phase silica gel chromatography and sephadex LH-20, in order to provide a reference for preparation of industrialization. According to the experimental results, comprehensive best quality and purity of phillyrin could be available when t...

Journal: :Journal of biopharmaceutical statistics 2002
Hansheng Wang Shein-Chung Chow Gang Li

Sample size calculation formulas for testing equality, noninferiority, superiority, and equivalence based on odds ratio were derived under both parallel and one-arm crossover designs. An example concerning the study of odds ratio between a test compound (treatment) and a standard therapy (control) for prevention of relapse in subjects with schizophrenia and schizoaffective disorder is presented...

Journal: :Journal of food protection 2012
Amanda M King Rhonda K Miller Alejandro Castillo Davey B Griffin Margaret D Hardin

Current industry chilling practices with and without the application of 2% L-lactic acid were compared for their effectiveness at reducing levels of Salmonella, Yersinia enterocolitica, and Campylobacter coli on pork variety meats. Pork variety meats (livers, intestines, hearts, and stomachs) were inoculated individually with one of the three pathogens and subjected to five different treatment...

2016
D. Barker P. McElduff C. D’Este M. J. Campbell

BACKGROUND Previous reviews have focussed on the rationale for employing the stepped wedge design (SWD), the areas of research to which the design has been applied and the general characteristics of the design. However these did not focus on the statistical methods nor addressed the appropriateness of sample size methods used.This was a review of the literature of the statistical methodology us...

2009
Jorge Chavarro Bernard Rosner

August 29, 2013 Version 0.0.6 Date 2012-03-28 Title Power and sample size calculation for survival analysis of epidemiological studies Author Weiliang Qiu , Jorge Chavarro , Ross Lazarus , Bernard Rosner , Jing Ma . Maintainer Weiliang Qiu <stwxq@ch...

2018
Haitao Pan Suyu Liu Danmin Miao Ying Yuan

BACKGROUND Sample size planning for longitudinal data is crucial when designing mediation studies because sufficient statistical power is not only required in grant applications and peer-reviewed publications, but is essential to reliable research results. However, sample size determination is not straightforward for mediation analysis of longitudinal design. METHODS To facilitate planning th...

2017
Caroline A. Kristunas Karen L. Smith Laura J. Gray

BACKGROUND The current methodology for sample size calculations for stepped-wedge cluster randomised trials (SW-CRTs) is based on the assumption of equal cluster sizes. However, as is often the case in cluster randomised trials (CRTs), the clusters in SW-CRTs are likely to vary in size, which in other designs of CRT leads to a reduction in power. The effect of an imbalance in cluster size on th...

Journal: :BMJ : British Medical Journal 2009
Pierre Charles Bruno Giraudeau Agnes Dechartres Gabriel Baron Philippe Ravaud

OBJECTIVES To assess quality of reporting of sample size calculation, ascertain accuracy of calculations, and determine the relevance of assumptions made when calculating sample size in randomised controlled trials. DESIGN Review. DATA SOURCES We searched MEDLINE for all primary reports of two arm parallel group randomised controlled trials of superiority with a single primary outcome publi...

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