{ "_id": "6a57f264ff0138dec5d72236", "Package": "appac", "Title": "Atmospheric Pressure Peak Area Correction for Gas Chromatography\nwith Standard Detectors", "Version": "4.0.3", "Authors@R": "person(\"Ruediger\", \"Forster\", , \"meticulous.measurements@gmail.com\",\nrole = c(\"aut\", \"cre\"),\ncomment = c(ORCID = \"0009-0006-4851-7430\"))", "Description": "Corrects gas-chromatography peak areas for the influence\nof ambient air pressure on standard detectors open to the\nambient atmosphere, such as the flame ionization detector,\nwhose pressure sensitivity was characterised by Bocek, Novak\nand Janak (1969) . Unlike\nthe pressure compensation of Ayers and Clardy (1985)\n, which is\ncombined with a calibration and valid only for a single\ncalibration period of a few days, per-cylinder peak areas are\ndecomposed by principal components into a pressure-correlated\ncomponent and per-peak drift; a common pressure-sensitivity\ncoefficient (kappa) is estimated with a heavy-tail-robust fit\non a drift-reduced signal, and slow drift plus a daily factor\nare removed. Returns the corrected areas together with a\nchi-square goodness-of-fit diagnostic. Structural-break\ndetection (package 'strucchange', Zeileis and others (2002)\n) is provided for episode-level and\nvariance breakpoint analysis.", "License": "GPL-3", "Encoding": "UTF-8", "VignetteBuilder": "knitr", "Config/testthat/edition": "3", "LazyData": "true", "Config/roxygen2/version": "8.0.0", "NeedsCompilation": "no", "Packaged": { "Date": "2026-07-15 20:46:34 UTC", "User": "root" }, "Author": "Ruediger Forster [aut, cre] (ORCID:\n)", "Maintainer": "Ruediger Forster ", "Repository": "https://cran.r-universe.dev", "Date/Publication": "2026-07-15 18:00:02 UTC", "RemoteUrl": "https://github.com/cran/appac", "RemoteRef": "HEAD", "RemoteSha": "546b3d4f3b7cb6bde362fd9f1b223baa1d5d0d4f", "_user": "cran", "_type": "src", "_file": "appac_4.0.3.tar.gz", "_fileid": "https://r2.ropensci.org/8b66d1bf4eb83c1d68904c59ff3e61c02a019d6b0b84a59b64687dac9d02d6dc", "_filesize": 2284683, "_sha256": "8b66d1bf4eb83c1d68904c59ff3e61c02a019d6b0b84a59b64687dac9d02d6dc", "_expires": 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