Description Usage Arguments Value Source
normalizes mass spectral signal either by the median fold change (probabilistic quotient) or total ion signal methods
1 |
peakTable |
either a data.frame, full file path as a character string to a .csv file of a peak table in the form observation (samples) in columns and variables (Mass spectral signals) in rows. If argument is not supplied a GUI file selection window will open and a .csv file can be selected. |
obsNames |
character vector of observation (i.e. sample/ QC/ Blank) names to identify appropriate observation (sample) columns. |
method |
either "medFC" for median fold change or "totIon" for total ion signal normalization. also a custom vector of factors equal in length to the obsNames argument with which to normalize the data can also be supplied. default = "medFC". |
a data frame identical to peakTable with samples normalized according to specificied method.
http://www.ncbi.nlm.nih.gov/pubmed/21526840 Optimized preprocessing of ultra-performance liquid chromatography/mass spectrometry urinary metabolic profiles for improved information recovery.
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