grandaverage.se: calculate the standard error of grandaverage of ERP data...
In erpR: Event-Related Potentials (ERP) Analysis, Graphics and Utility Functions

Description Usage Arguments Value Note Author(s) See Also Examples

A function to average ERP objects, i.e. data frames with timepoints in rows, electrodes in columns and amplitude values in each cell. It is used to compute the grandaverage.se across several subjects, for plotting purposes.

1 2	grandaverage.se(base, numbers, electrodes="all", erplist = NULL, startmsec=NULL, endmsec=NULL, NA.sub=TRUE, type="se")

`base`	a string indicating the beginning of the name of the `data.frame` containing the ERP data.
`numbers`	the numbers of subjects to be averaged.
`electrodes`	a character vector indicating the electrodes on which perform the grandaverage.se. Default is `"all"`, and the `grandaverage.se` is performed on all electrodes of the data frames.
`startmsec`	the start time (in ms) of the `erpdf`.
`endmsec`	the end time (in ms) of the `erpdf`.
`erplist`	a list containing ERP data frames.
`NA.sub`	In this case, a Warning is displayed.
`type`	currently the only type available is `se`, future version will include other possibilities.

A data frame with the standard error of the mean calculated from the subjects specified by the combination of base and numbers.

The function keeps track of the name of the objects used to calculated standard error in a comment.

Giorgio Arcara

grandaverage,grandaverage.se

data(erplistExample)
# compute the average of subjects 1 to 20 for the condition 
# specified by the string "Exp1_word_subj".
	
word=grandaverage.se("Exp1_word_subj", 1:20, erplist=erplistExample)