Figure 6

Estimated precisions for different platforms as a function of expression level. The curves are lowess trend curves fitted to the log₂${\sigma }_p^2$ values for the two-color platforms, corresponding to a direct comparison with one array with dye-effect adjustment, and to the log _p 2${\varphi }_p^2$ values for Affymetrix, corresponding to a comparison of two arrays. The horizontal axis is the average log-intensity over the A1 arrays for the two color platforms and over the A1 and B arrays for Affymetrix. Each unit on the vertical axis corresponds to a doubling of statistical information.