Please use this identifier to cite or link to this item: https://doi.org/10.1186/1471-2105-10-415
Title: Effects of normalization on quantitative traits in association test
Authors: Goh, L. 
Yap, V.B. 
Issue Date: 14-Dec-2009
Source: Goh, L., Yap, V.B. (2009-12-14). Effects of normalization on quantitative traits in association test. BMC Bioinformatics 10 : -. ScholarBank@NUS Repository. https://doi.org/10.1186/1471-2105-10-415
Abstract: Background: Quantitative trait loci analysis assumes that the trait is normally distributed. In reality, this is often not observed and one strategy is to transform the trait. However, it is not clear how much normality is required and which transformation works best in association studies. Results: We performed simulations on four types of common quantitative traits to evaluate the effects of normalization using the logarithm, Box-Cox, and rank-based transformations. The impact of sample size and genetic effects on normalization is also investigated. Our results show that rank-based transformation gives generally the best and consistent performance in identifying the causal polymorphism and ranking it highly in association tests, with a slight increase in false positive rate. Conclusion: For small sample size or genetic effects, the improvement in sensitivity for rank transformation outweighs the slight increase in false positive rate. However, for large sample size and genetic effects, normalization may not be necessary since the increase in sensitivity is relatively modest. © 2009 Goh and Yap; licensee BioMed Central Ltd.
Source Title: BMC Bioinformatics
URI: http://scholarbank.nus.edu.sg/handle/10635/110052
ISSN: 14712105
DOI: 10.1186/1471-2105-10-415
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