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Figure 1 | BMC Bioinformatics

Figure 1

From: Correlation test to assess low-level processing of high-density oligonucleotide microarray data

Figure 1

Correlations between the unnormalized expression values of 5000 randomly selected pairs of genes. Top: The distribution of the correlation coefficients is centered far away from zero for all expression measures and data sets. Bottom: Scatterplots of the correlations versus the product of the standard deviations of the genes for the randomly selected pairs. Local mean correlations are shown in blue and indicate that correlations decrease with variability. Shown in red is a simple model for lack of normalization that was fitted to the data.

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