Results 231 to 240 of about 1,987,342 (275)

Sample Size Calculation

2018
In this chapter the basic principles of sample size calculation are discussed. The chapter also reviews the impact of sample size calculation on the study results, the parameters needed, and ways this calculation can be performed by researchers.
Mohammad Azfar Qureshi, Jessica K Paulus, Felipe Fregni   +2 more
openaire   +1 more source

Proposals for Sample Size Calculation Programs

Methods of Information in Medicine, 2007
Summary Objectives : Numerous sample size calculation programs are available nowadays. They include both commercial products as well as public domain and open source applications. We propose modifications for these programs in order to even better support statistical consultation during the planning stage of a two-armed
H, Heinzl, A, Benner, C, Ittrich, M, Mittlböck   +3 more
openaire   +2 more sources

Sample size calculations

2013
In this chapter several sample size calculation formulas are introduced. They include the standard sample size calculation formula for both continuous and dichotomous outcomes as well as the adjustments for either clustering (i.e., for a cluster RCT) or designs with more than one follow-up measurement. Besides the formulas and an example how to use the
openaire   +1 more source

Sample size calculations for evaluating mediation

Statistics in Medicine, 2008
AbstractThis paper presents sample size calculations for testing the mediation of the effect of a primary predictor by an intermediate variable. This problem is related to validating surrogate markers and to testing the effect of a primary predictor in the presence of confounders.
E, Vittinghoff, S, Sen, C E, McCulloch
openaire   +2 more sources

Sample Size Calculations for Ophthalmologic Studies

Archives of Ophthalmology, 1992
Sample size calculations are shown for some common ophthalmologic study designs in which two treatments are to be compared. Included are the following three designs: 1, only one eye per subject; 2, both eyes, with each eye assigned to a different treatment; and 3, both eyes undergoing a common treatment.
W J, Gauderman, W E, Barlow
openaire   +2 more sources

Sample size calculation in economic evaluations

Health Economics, 1998
A simulation method is presented for sample size calculation in economic evaluations. As input the method requires: the expected difference and variance of costs and effects, their correlation, the significance level (alpha) and the power of the testing method and the maximum acceptable ratio of incremental effectiveness to incremental costs.
Al, Maiwenn, van Hout, BA (Ben), Bowine, CM, Rutten, FFH   +3 more
openaire   +3 more sources

Representative Drug Sampling: Sample Size Calculations Revisited

Journal of Forensic Sciences, 2010
Abstract:  Calculating the required number of samples to be tested from a consignment of pills suspected of containing drugs can be performed from a Bayesian perspective. Procedures in literature are based on the outstanding work of Aitken. However, in the mathematical treatment of the problem, the limitedness of the consignment is not systematically ...
openaire   +2 more sources

Increasing the size and complexity of discrete 2D metallosupramolecules

Nature Reviews Materials, 2021
Heng Wang, Yiming Li, Na Li
exaly  

Sample Size Calculations

2021
openaire   +1 more source

Size-Dependent Oxidation-Induced Phase Engineering for MOFs Derivatives Via Spatial Confinement Strategy Toward Enhanced Microwave Absorption

Nano-Micro Letters, 2022
Mingqiang Ning, Yang Zhao, Panbo Liu
exaly