Hi,

 I am using in R the dChip method to normalize and summarize my micro
arrays.
I tried several times and I always get warnings. What this does mean? Are
the expression levels
returned reliable anyway ?

I use R2.4.1 on linux redhat

Marco


eset <- expresso(hum.brain.embryo, bg.correct =
FALSE,normalize.method="invariantset",
pmcorrect.method = "pmonly",summary.method="liwong")
normalization: invariantset
PM/MM correction : pmonly
expression values: liwong
normalizing...done.
54675 ids to be processed
|                    |
|####################|
There were 50 or more warnings (use warnings() to see the first 50)

Warning messages:
1: No convergence achieved in outlier loop
 in: fit.li.wong(probes, ...)
2: No convergence achieved in outlier loop
 in: fit.li.wong(probes, ...)
3: No convergence achieved in outlier loop
 in: fit.li.wong(probes, ...)
4: No convergence achieved in outlier loop
 in: fit.li.wong(probes, ...)

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