Imperial College London

ProfessorPaulElliott

Faculty of MedicineSchool of Public Health

Chair in Epidemiology and Public Health Medicine
 
 
 
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Contact

 

+44 (0)20 7594 3328p.elliott Website

 
 
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Assistant

 

Miss Jennifer Wells +44 (0)20 7594 3328

 
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Location

 

154Norfolk PlaceSt Mary's Campus

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Summary

 

Publications

Citation

BibTex format

@article{Blaise:2016:10.1021/acs.analchem.6b00188,
author = {Blaise, B and Correia, G and Tin, A and Young, J and Vergnaud, A and Lewis, M and Pearce, J and Elliott, P and Nicholson, J and Holmes, E and Ebbels, TMD},
doi = {10.1021/acs.analchem.6b00188},
journal = {Analytical Chemistry},
pages = {5179--5188},
title = {A novel method for power analysis and sample size determination in metabolic phenotyping},
url = {http://dx.doi.org/10.1021/acs.analchem.6b00188},
volume = {88},
year = {2016}
}

RIS format (EndNote, RefMan)

TY  - JOUR
AB - Estimation of statistical power and sample size is a key aspect of experimental design. However, in metabolic phenotyping, there is currently no accepted approach for these tasks, in large part due to the unknown nature of the expected effect. In such hypothesis free science, neither the number or class of important analytes nor the effect size are known a priori. We introduce a new approach, based on multivariate simulation, which deals effectively with the highly correlated structure and high-dimensionality of metabolic phenotyping data. First, a large data set is simulated based on the characteristics of a pilot study investigating a given biomedical issue. An effect of a given size, corresponding either to a discrete (classification) or continuous (regression) outcome is then added. Different sample sizes are modeled by randomly selecting data sets of various sizes from the simulated data. We investigate different methods for effect detection, including univariate and multivariate techniques. Our framework allows us to investigate the complex relationship between sample size, power, and effect size for real multivariate data sets. For instance, we demonstrate for an example pilot data set that certain features achieve a power of 0.8 for a sample size of 20 samples or that a cross-validated predictivity QY2 of 0.8 is reached with an effect size of 0.2 and 200 samples. We exemplify the approach for both nuclear magnetic resonance and liquid chromatography–mass spectrometry data from humans and the model organism C. elegans.
AU - Blaise,B
AU - Correia,G
AU - Tin,A
AU - Young,J
AU - Vergnaud,A
AU - Lewis,M
AU - Pearce,J
AU - Elliott,P
AU - Nicholson,J
AU - Holmes,E
AU - Ebbels,TMD
DO - 10.1021/acs.analchem.6b00188
EP - 5188
PY - 2016///
SN - 1520-6882
SP - 5179
TI - A novel method for power analysis and sample size determination in metabolic phenotyping
T2 - Analytical Chemistry
UR - http://dx.doi.org/10.1021/acs.analchem.6b00188
UR - http://hdl.handle.net/10044/1/31673
VL - 88
ER -