Sample size calculations
Sample size calculations for skewed distributions
... Sample size calculations estimate the required number of patients to meet a study ’ s ...practice. Sample size calculations are often based on normal approximation, such as those ...
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2 Precision-based sample size calculations
... to sample size calculations Rosie ...your sample should be. If you increase your sample size you increase the precision of your estimates, which means that, for any given ...
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Practical guide to sample size calculations: superiority trials
... The formulae for sample size calculations are then given, highlighting how each of the components forms part of the calculation. Worked examples are used to demonstrate the operational steps in a ...
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A multivariate approach to sample size calculations for thorough QT studies
... hence sample size cal- culations play a very important role in ensuring a small but adequately powered thorough QT ...and sample size ...smaller sample size for fixed ...
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Power and Sample Size Calculations for Interval-Censored Survival Analysis
... and sample size calculations for current status survival analysis based on the Wald test assuming a Weibull survival model and various censoring ...power calculations demonstrated that studies ...
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Sample size calculations for model validation in linear regression analysis
... sufficient sample size to detect scientifically credible ...and sample size problem for model validation has not been adequately examined in the ...and sample size ...
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Practical guide to sample size calculations: non-inferiority and equivalence trials
... A sample size justification is a vital part of any trial ...suitable sample size ...conducting sample size calculations for non-inferiority and equivalence trials are ...
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Sample size calculations for cluster randomised trials, with a focus on ordinal outcomes.
... Those which were not identified were cited by eligible papers and so would have been identified as eligible for the review from a search of references, alongside the context of the citation in the included paper. ...
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Sample size calculations in pediatric clinical trials conducted in an ICU: a systematic review
... Further limitations of our study are the quite specific in- clusion criteria (trials with pharmacological interventions and conducted in an ICU). The findings may not be generalizable beyond this group of trials. ...
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Sample size calculations for stepped wedge and cluster randomised trials: a unified approach
... cluster size, as well as the required cluster size, given a specified number of ...correct sample size calculations under a va- riety of scenarios; (2) demonstrate that the SW-CRT does ...
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Bayesian average error based approach to sample size calculations for hypothesis testing
... framework, sample size calculations for a hypothesis test of interest are made to adequately maintain pre-specified Type-I and Type-II error ...and sample size determination using ...
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Sample size calculations for controlling the distribution of false discovery proportion in microarray experiments
... including sample size calculations as well as to the analysis of microarray ...for sample size calculation to detect differen- tial genes are to control the expectation of FDP, that is ...
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Sample Size Calculations for Population Size Estimation Studies Using Multiplier Methods With Respondent Driven Sampling Surveys
... around size estimates and does not discuss a consideration of bias resulting from unmet assumptions of both the multiplier and RDS methods, which we consider elsewhere ...population size [18,19]. However, ...
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Sample Size Calculations for Population Size Estimation Studies Using Multiplier Methods With Respondent Driven Sampling Surveys
... around size estimates and does not discuss a consideration of bias resulting from unmet assumptions of both the multiplier and RDS methods, which we consider elsewhere ...population size [18,19]. However, ...
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Sample Size Calculations for Population Size Estimation Studies Using Multiplier Methods With Respondent-Driven Sampling Surveys.
... our sample size calculations, but it is possible that a higher value would be more ...population size estimation study of 9 communities in Zimbabwe, we found evidence of high homophily by ...
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Sample size calculations for the design of health studies: a review of key concepts for non-statisticians
... Abstract: Sample size calculations before con- ducting a health study or clinical trial are impor- tant to provide evidence that the proposed study is capable of detecting real associations between ...
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Sample size calculations for crossover thorough QT studies: Non-inferiority and assay sensitivity
... hence sample size calculations play a very important role in ensuring an adequately powered thorough QT ...in sample size and power, in case one looks to more general covariance ...
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Reporting and methodological quality of sample size calculations in cluster randomized trials could be improved: a review
... sample size. Albeit on a small and possibly unrepresentative sample, compari- sons between a priori estimates and observed values of the within-cluster correlation showed that authors tended to as- ...
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A Guide to Sample Size Calculations for Random Effect Models via Simulation and the MLPowSim Software Package
... on sample sizes for multiple hypotheses, and using sample size calculations as ‘rough guides’ This example illustrates several important factors when constructing sample size ...
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Sample size calculations based on a difference in medians for positively skewed outcomes in health care studies
... tumour size or features in cancer patients [5, 6] and time outcomes [7, 8], amongst many ...the sample size [9, ...standard sample size calculations based on t-tests or Z-tests ...
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