erplist.offset: Remove offset in an erplist.
In erpR: Event-Related Potentials (ERP) Analysis, Graphics and Utility Functions

Description Usage Arguments Details Value Author(s) Examples

Remove offset (i.e. perform baseline correction) on all the objects of an erplist.

1 2	erplist.offset(base, numbers, win.ini, win.end, erplist=NULL, startmsec=NULL, endmsec=NULL)

`base`	a string indicating the beginning of the name of `data.frame` containing ERP data.
`numbers`	the numbers of the subjects to be averaged by the function.
`win.ini`	the initial edge (in ms) of the window on which the offset should be calculated.
`win.end`	the final edge (in ms) of the window on which the offset should be calculated.
`erplist`	a list containing the ERP data frames specified in `base` and `numbers`.
`startmsec`	the start time (in ms) of the ERP vector
`endmsec`	the end time (in ms) of the ERP vector

The function perform a DC offset (or baseline) correction in all he objects of an erplist. It simply calcualte (separately for each object and each electrode), the mean value in the window specified with win.ini, and win.end and subtract from all the vector.

A new erplist with the data modified according to the offset correction.

Giorgio Arcara

data(erplistExample)

erplist_res=erplist.offset(base="Exp1_word_subj", numbers=1:20,
win.ini=-200, win.end=0, erplist=erplistExample)

# original data are now baseline corrected according to the time window going from -200 to 0.