Values for the Filtering of the Microarray Probeset Level Data.

Table 1A are the parameters for the Golub filtering and Table 1B are the parameters for the median based fitting. Where r is the ratio between the highest and lowest level of expression for a particular probe across all the arrays and d is the difference between the maximum and minimum expression levels. IQR is the interquartile range and the lower threshold must be passed by at least 25% of the arrays.