Hi, I'm doing analysis of microarray data with affylmGUI package, and to make a comparison by using affylmGUI and dChip ( http://biosun1.harvard.edu/complab/dchip/ another tool to analyse microarrays). I'm trying to use the same criteria as many as I can, but there's a "90% lower confidence bound" to filter genes. Does anyone know how to calculate this "lower confidence bound" in R or by using a specific package. Thanks! Feifei Ding