Help file for Normalization function

[kpberger]

Can anyone point me to a help file that explains the ratio and ratioNum options for Normalization? The R help file only says the following:

ratio	This option is only for biomarker analysis.
ratioNum	Relevant only for biomarker analysis.

Thanks!

[xia.lab]

This is related to computing metabolite ratios to improve biomarker discovery (see below)