Incorporating Nonlinear Relationships  in Microarray Missing Value Imputation.
Microarray gene expression data often contain missing values. Accurate estimation of the missing values is important for downstream data analyses that require complete data. Nonlinear relationships between gene expression levels have not been well-utilized in missing value imputation. We propose an imputation scheme based on nonlinear dependencies between genes. By simulations based on real microarray data, we show that incorporating nonlinear relationships could improve the accuracy of missing value imputation, both in terms of normalized root-mean-squared error and in terms of the preservation of the list of significant genes in statistical testing. In addition, we studied the impact of artificial dependencies introduced by data normalization on the simulation results. Our results suggest that methods relying on global correlation structures may yield overly optimistic simulation results when the data have been subjected to row (gene)-wise mean removal.
Yu
Tianwei
T
Department of Biostatistics and Bioinformatics, 1518 Clifton Rd., N.E., 3rd Floor, Rollins School of Public Health, Emory University, Atlanta, GA 30322, USA. tyu8@emory.edu
Peng
Hesen
H
Sun
Wei
W
D000818:Animals; D045744:Cell Line, Tumor; D019295:Computational Biology / Q000379:methods*; D003198:Computer Simulation; D030541:Databases, Genetic; D020869:Gene Expression Profiling / Q000379:methods*; D006801:Humans; D016393:Lymphoma, B-Cell / Q000235:genetics; D015233:Models, Statistical; D017711:Nonlinear Dynamics; D020411:Oligonucleotide Array Sequence Analysis / Q000379:methods*; D012474:Salmon / Q000235:genetics; D015003:Yeasts / Q000235:genetics