Figure 4From: Probe set algorithms: is there a rational best bet?Log transformation of absent call signals shows a strong reduction in variance, leading to a greater proportion of sufficiently powered probe sets through greater precision, but less accuracy (higher expected false positives). Log transformation of data is a commonly used method to reduce variance, and thus increase precision. Taking the same data set shown in Figure 3 and log transforming the data effectively increases the proportion of probe sets that are sufficiently powered at low numbers of arrays per group.Back to article page