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• W2023784234 abstract "The synthesis of information across microarray studies has been performed by combining statistical results of individual studies (as in a mosaic), or by combining data from multiple studies into a large pool to be analyzed as a single data set (as in a melting pot of data). Specific issues relating to data heterogeneity across microarray studies, such as differences within and between labs or differences among experimental conditions, could lead to equivocal results in a melting pot approach.We applied statistical theory to determine the specific effect of different means and heteroskedasticity across 19 groups of microarray data on the sign and magnitude of gene-to-gene Pearson correlation coefficients obtained from the pool of 19 groups. We quantified the biases of the pooled coefficients and compared them to the biases of correlations estimated by an effect-size model. Mean differences across the 19 groups were the main factor determining the magnitude and sign of the pooled coefficients, which showed largest values of bias as they approached ±1. Only heteroskedasticity across the pool of 19 groups resulted in less efficient estimations of correlations than did a classical meta-analysis approach of combining correlation coefficients. These results were corroborated by simulation studies involving either mean differences or heteroskedasticity across a pool of N > 2 groups.The combination of statistical results is best suited for synthesizing the correlation between expression profiles of a gene pair across several microarray studies." @default.
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• W2023784234 date "2013-07-04" @default.
• W2023784234 modified "2023-10-14" @default.
• W2023784234 title "Comprehensive analysis of correlation coefficients estimated from pooling heterogeneous microarray data" @default.
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• W2023784234 doi "https://doi.org/10.1186/1471-2105-14-214" @default.
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