Applies a lightweight generic detrending step to any numeric Gazepoint signal, either globally or within participant/trial groups. This is useful for slow drift in channels such as EDA, pupil size, PPG baseline, or temperature.
Usage
detrend_gazepoint_signal(
data,
signal_col = NULL,
time_col = NULL,
group_cols = NULL,
method = c("linear", "mean", "median", "loess", "none"),
span = 0.3,
preserve_mean = FALSE,
suffix = "_detrended"
)Arguments
- data
Data frame or numeric vector.
- signal_col
Signal column for data-frame input.
- time_col
Optional time column. If omitted, sample index is used.
- group_cols
Optional grouping columns for within-group detrending.
- method
Detrending method:
"linear","mean","median","loess", or"none".- span
Span for LOESS detrending.
- preserve_mean
If TRUE, add the mean trend back after removing drift.
- suffix
Suffix for the detrended signal column.