Core Functions to Read and Fit 13c Time Series from Breath Tests R package breathtestcore version 0.8.11 Reads several formats of 13C data (IRIS/Wagner, BreathID) and CSV. Creates artificial sample data for testing. Fits Maes/Ghoos, Bluck-Coward self-correcting formula using 'nls', 'nlme'. Methods to fit breath test curves with Bayesian Stan methods are refactored to package 'breathteststan'. For a Shiny GUI, see package 'dmenne/breathtestshiny' on github. Software Depends: R (>= 4.1.0) Imports: assertthat, dplyr, ggfittext, ggplot2, broom (>= 0.7.0), graphics, grid, MASS, methods, multcomp, nlme, purrr, readr, readxl, signal, stats, stringr, tibble (>= 3.0.0), tidyr, tools, utils, xml2 Suggests: base, gridExtra, qpdf, knitr, rmarkdown, testthat(>= 2.99), breathteststan, covr Dieter Menne <dieter.menne@menne-biomed.de> Comprehensive R Archive Network (CRAN) Dieter Menne [aut, cre], Menne Biomed Consulting Tuebingen [cph], Benjamin Misselwitz [fnd], Mark Fox [fnd], Andreas Steingoetter [dtc], University Hospital of Zurich, Dep. Gastroenterology [fnd, dtc] GPL-3 2026-07-13 application/tgz https://CRAN.R-project.org/package=breathtestcore doi:10.32614/CRAN.package.breathtestcore