[R] Lower Confidence Bound

[Feifei]

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