[BioC] [BioC]Li.Wong expression values < 0?

[Song, Guangchun]

Hi,

Has anyone gotten negative expression values when using li.wong
normalization by Affy?  What the negative values mean?

Here are what I did:

> mouse <- ReadAffy()
> liwong = express(mouse, bg=subtractmm, summary.stat=li.wong)
> write.exprs(liwong,file="LiWong.txt")

The min = -2358.292881, and max = 8763.940708.


Guangchun