RPA: Robust Probabilistic Averaging for probe-level analysis
Probabilistic analysis of probe reliability and
    differential gene expression on short oligonucleotide
    arrays. Lahti et al. "Probabilistic Analysis of Probe
    Reliability in Differential Gene Expression Studies with
    Short Oligonucleotide Arrays", TCBB/IEEE, 2011.
    http://doi.ieeecomputersociety.org/10.1109/TCBB.2009.38