Figure 5

Boxplots of genewise standard deviations with which a log-fold change is measured using the smallest possible experiment for each platform. Lower values correspond to greater precision and each unit of the vertical axis corresponds to a doubling of statistical information. For the two-color platforms, values of log₂${\widehat{\sigma }}_p^2$ are plotted, corresponding to a direct comparison with one array after adjustment for probe-specific dye-effects. For Affymetrix, values of log₂$2{\widehat{\varphi }}_p$ are plotted corresponding to a comparison of two arrays. The median lines correspond to the direct design median values in Table 2, and the boxplot outlines correspond to the Q1 and Q3 given in Table 2.