[BioC] flow cytometry data

[David martin]

Hi,
I've recently got some data from the lab coming from flow cytometry.
I have the log10 values corresponding to the geometrical mean (not the 
flow cytometry files).

Basically i would like to start from that matrix and compute the fold 
changes. I'm not sure which test is most suitable as not sure which 
sitribution the data follows , gaussian ??? could anybody suggest how to 
move on from the log10 data matrix ? Any paper or tutorial .
I have already looked at the flow packages within R but most of them 
deal with gating and scaling the raw data, but not how to compute fold 
changes

thanks for any help,
david