appac: Atmospheric Pressure Peak Area Correction for Gas Chromatography
with Standard Detectors
Corrects gas-chromatography peak areas for the influence of ambient
air pressure on standard detectors open to the ambient atmosphere, such as
the flame ionization detector, whose pressure sensitivity was
characterised by Bocek, Novak and Janak (1969)
<doi:10.1016/S0021-9673(00)99223-9>. Unlike the pressure compensation of
Ayers and Clardy (1985) <https://patents.google.com/patent/US4512181A>, which
is combined with a calibration and valid only for a single calibration period
of a few days, per-cylinder peak areas are decomposed by principal components
into a pressure-correlated component and per-peak drift; a common
pressure-sensitivity coefficient (kappa) is estimated with a heavy-tail-robust
fit on a drift-reduced signal, and slow drift plus a daily factor are removed.
Returns the corrected areas together with a chi-square goodness-of-fit
diagnostic. Structural-break detection (package 'strucchange', Zeileis and
others (2002) <doi:10.18637/jss.v007.i02>) is provided for episode-level and
variance breakpoint analysis.
| Version: |
4.0.3 |
| Depends: |
R (≥ 4.0.0) |
| Imports: |
methods, stats, utils, data.table, dplyr, tibble, purrr, kza, robustbase, strucchange |
| Suggests: |
ggplot2, patchwork, knitr, rmarkdown, testthat (≥ 3.0.0) |
| Published: |
2026-07-15 |
| DOI: |
10.32614/CRAN.package.appac (may not be active yet) |
| Author: |
Ruediger Forster 
[aut, cre] |
| Maintainer: |
Ruediger Forster <meticulous.measurements at gmail.com> |
| License: |
GPL-3 |
| NeedsCompilation: |
no |
| Citation: |
appac citation info |
| Materials: |
README, NEWS |
| CRAN checks: |
appac results |
Documentation:
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