# Atmospheric Pressure Peak Area Correction for Gas Chromatography with Standard Detectors

## Documentation for package ‘appac’ version 4.0.3

- DESCRIPTION file.
- User guides, package vignettes and other documentation.
- Package NEWS.

## Help Pages

appac | Fit the APPAC pressure correction
Appac-class | Fitted APPAC model
check_cols | Validate and canonicalise the input columns
Compensation-class | Drift / daily-factor model
Correction-class | Pressure correction model
debias_ct | De-bias the per-peak centres
get_changepoints | Detect episode level breakpoints across cylinders
get_variance_changepoints | Detect variance breakpoints across cylinders
goodness_of_fit | Goodness of fit of the correction
plot_area_date | Plot peak area versus date
plot_area_pressure | Plot peak area versus air pressure
plot_area_pressure_fit | Plot the kappa-fit input
PLOT_FID | Flame-ionization-detector peak areas for APPAC
plot_residuals | Residual diagnostic panel
print-method | Fitted APPAC model
show-method | Fitted APPAC model
show-method | Drift / daily-factor model
show-method | Pressure correction model
Synth_data | Synthetic stress-test data for APPAC