Residual sum of squares (RSS) plot for all 24 samples. Using the mean quality score across all samples for each probe as the baseline, the sum of squares of the difference between quality score for each sample and the baseline was determined. Samples #4, #14, #17, and #18 were outliers as had been shown by the generalized extreme studentized deviate (GSD) many-outlier procedure performed in Figure 2 .
Xie et al. BMC Bioinformatics 2011 12:402 doi:10.1186/1471-2105-12-402