View source: R/baseline_correction.R
rm_baseline | R Documentation |
Used to correct data using the mean of a specified time period. For
time-domain data, this will subtract the mean from all data. For eeg_tfr
objects, a variety of methods are available, including subtraction, and
conversion to "dB" change. With a data frame, it will search for "electrode"
and "epoch" columns, and groups on these when found. An electrode column is
always required; an epoch column is not. Note that baseline correction is
always applied on single-trial basis. For baseline correction based on
subtraction, this makes no difference compared to averaging first and then
baseline correcting, but for divisive measures used with time-frequency data,
this distinction can be very important, and can lead to counterintuitive
results.
rm_baseline(data, time_lim = NULL, ...) ## S3 method for class 'eeg_data' rm_baseline(data, time_lim = NULL, verbose = TRUE, ...) ## S3 method for class 'eeg_epochs' rm_baseline(data, time_lim = NULL, verbose = TRUE, ...) ## S3 method for class 'data.frame' rm_baseline(data, time_lim = NULL, verbose = TRUE, ...) ## S3 method for class 'eeg_tfr' rm_baseline(data, time_lim = NULL, type = "divide", verbose = TRUE, ...) ## S3 method for class 'eeg_evoked' rm_baseline(data, time_lim = NULL, verbose = TRUE, ...)
data |
Data to be baseline corrected. |
time_lim |
Numeric character vector (e.g. time_lim <- c(-.1, 0)) defining the time period to use as a baseline. If the value is NULL, it uses the mean of the whole of each epoch if the data is epoched, or the channel mean if the data is continuous. |
... |
other parameters to be passed to functions |
verbose |
Defaults to TRUE. Output descriptive messages to console. |
type |
Type of baseline correction to apply. Options are ("divide", "ratio", "absolute", "db", and "pc") |
An eegUtils
object or a data.frame
, depending on the input.
eeg_data
: remove baseline from continuous eeg_data
eeg_epochs
: Remove baseline from eeg_epochs
data.frame
: Legacy method for data.frames
eeg_tfr
: Method for eeg_tfr
objects
eeg_evoked
: Method for eeg_evoked
objects
Matt Craddock matt@mattcraddock.com
rm_baseline(demo_epochs) rm_baseline(demo_epochs, c(-.1, 0))
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