rumenGP 0.2.0

New Models

Added two new nonlinear gas production models:

• Burr XII
• Inverse Paralogistic

Burr XII

Equation:

V(t) = VF [1 - (1 + (rt)^a)(-p)]

Features:

• Flexible four-parameter sigmoidal model
• Accommodates diverse fermentation profiles
• Supports asymmetry and variable inflection behavior
• Useful for comparative model-selection studies

Inverse Paralogistic

Equation:

V(t) = VF [1 + (rt)^(-a)]^(-a)

Features:

• Flexible three-parameter sigmoidal model
• Biologically interpretable asymptote
• Strong performance across diverse fermentation profiles

Documentation Improvements

Model Reference Vignette

Updated the “Model Equations Reference” vignette:

• Added Burr XII documentation
• Added Inverse Paralogistic documentation
• Added model-selection guidance
• Expanded model-equivalence discussion

Model Interpretation Vignette

Updated the “Interpreting Gas Production Models” vignette:

• Added interpretation of Burr XII parameters
• Added interpretation of Inverse Paralogistic parameters
• Expanded discussion of shape parameters
• Added model-equivalence interpretation
• Added practical model-selection guidance

Getting Started Vignette

Updated the “Getting Started with rumenGP” vignette:

• Added Burr XII examples
• Added Inverse Paralogistic examples
• Expanded model-comparison workflow
• Added model-selection recommendations

Importing Non-ANKOM Data Vignette

Updated the “Importing Non-ANKOM Data” vignette:

• Added examples using newly implemented models
• Expanded model-comparison examples
• Added model-equivalence notes

Model Equivalence Documentation

Documented the mathematical equivalence of:

• Groot
• Generalized Michaelis-Menten
• Log-logistic

Parameter correspondence:

• VF = A = VF
• b = K = 1/r
• k = c = a

Clarified that the Log-logistic formulation is already represented through the existing Groot and generalized Michaelis-Menten parameterizations.

README Improvements

Updated package documentation:

• Added Burr XII
• Added Inverse Paralogistic
• Documented model equivalence
• Expanded model-comparison examples
• Added recommended model-selection workflow
• Updated built-in model count

Package Content

Current built-in model library:

• Brody
• Dual Logistic
• EXP0
• EXPL
• Gompertz
• Groot
• LE0
• LEL
• Logistic
• Mitscherlich
• Generalized Michaelis-Menten
• Ørskov and McDonald
• Burr XII
• Inverse Paralogistic

Total:

• 14 built-in kinetic models

Quality Assurance

• Updated package documentation throughout
• Updated package website content
• Updated vignettes
• Updated examples
• Maintained clean package checks

R CMD check:

• 0 errors
• 0 warnings
• 0 notes