Core Functions to Read and Fit 13c Time Series from Breath Tests
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'.
See Bluck L J C and Coward W A 2006 <10.1088>.
fit breath test curves with Bayesian Stan methods are refactored to
package 'breathteststan'. For a Shiny GUI, see
package 'dmenne/breathtestshiny', currently on github only.10.1088>