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. 2003 Feb 15;31(4):e15. doi: 10.1093/nar/gng015

Figure 4.

Figure 4

Figure 4

Figure 4

MvA plots (described in the text) for Affymetrix’s spike-in experiment. (A) For MAS 5.0, observed log (base 2) fold change (M) is plotted against average log (base 2) expression (A) for all genes from spike-in experiment array pairs. A reference array was selected from one of the replicate spike-in experiments and compared to all other arrays in that replicate experiment. The colored numbers represent the log (base 2) fold change in concentrations of all 14 spiked-in genes. Each distinct fold change is represented with a different color as a visual aid. The –∞ and ∞ represent fold changes with a zero in the numerator or denominator, respectively. The red points represent non-spiked-in genes with a fold change larger than 2. (B) As (A) but using dChip. (C) As (A) but using RMA.