R: Core Functions to Read and Fit 13c Time Series from Breath Tests

# Core Functions to Read and Fit 13c Time Series from Breath Tests

## Documentation for package ‘breathtestcore’ version 0.8.10

- DESCRIPTION file
- User guides, package vignettes and other documentation

## Help Pages

AIC.breathtestnlmefit | S3 AIC method for breathtestnlmefit
augment.breathtestfit | Augmented prediction for breathtest fit
breathtest_data | Data structure with PDR data and descriptors for breath test records
breathtest_read_function | Snoop method to read breath test file
btcore_file | Path to example breath test data file
cleanup_data | Transforms 13C breath data into a clean format for fitting
coef.breathtestfit | S3 coef and summary for breathtestfit
coef_by_group | Tabulates per-group breath test parameters
coef_diff_by_group | Tabulates breath test parameter differences of groups
cum_exp_beta | Cumulative exponential beta function
dob_to_pdr | Convert breath test DOB data to PDR data
exp_beta | Exponential beta function for 13C breath data
extract_id | Extracts an ID from string IRIS CSV file
nlme_fit | Mixed-model nlme fit to 13C Breath Data
nls_fit | Individual curve fit with nls to 13C breath test data
null_fit | Convert data to class breathtestfit
plot.breathtestfit | S3 plot method for breathtestfit
read_any_breathtest | Read breathtest files of any format
read_breathid | Read BreathID file
read_breathid_xml | Read new BreathID/Examens XML file
read_breathtest_excel | Reads breathtest data in Excel format
read_iris | Read 13C data from IRIS/Wagner Analysen
read_iris_csv | Read 13C data from IRIS/Wagner Analysen in CSV Format
sigma.breathtestnlmefit | S3 method to extract the fit's residual standard deviation
simulate_breathtest_data | Simulate 13C breath time series data
subsample_data | Decimate densely sampled 13C time series
t50_bluck_coward | Bluck-Coward self-corrected half-emptying time
t50_maes_ghoos | Half-emptying time by Maes/Ghoos method
t50_maes_ghoos_scintigraphy | Half-emptying time t50 from Maes/Ghoos fit with scintigraphic correction
tidy.breathtestfit | Broom-style tidying methods for breathtestfit
tlag_bluck_coward | Lag phase for Bluck-Coward self-correcting fit
tlag_maes_ghoos | So-called lag time from Maes/Ghoos fit
usz_13c | Zurich sample set of 13C breath test data
usz_13c_a | Exotic 13C breath test data
usz_13c_d | 13C breath test data with MRI emptying for comparison