(Standardised) Major Axis Estimation and Testing Routines
Utility functions for robust fitting
Common slope estimation
Extract coefficients from a 'sma' or 'ma' fit
Calculates a confidence inteval for a common slope (called by slope.co...
Test for equal elevation among several lines fitted with (standardised...
One-sample test of a (standardised) major axis elevation
Returns fitted values
Slope and elevation of a (standardised) major axis, with confidence in...
Likelihood ratio statistic, assuming a common slope (called by slope.c...
Generate spacing for minor tick marks on a plot with log-scaled axes
Measurement error variance estimation from repeated measures
Multiple comparisons graphical matrix
Utility plotting functions
Draw an X-Y plot
Print an object of class 'sma'.
Extract model residuals
Sequence Generation
Test for no mean shift along a common (standardised) major axis
Common slope test amongst several allometric lines
One-sample test of a (standardised) major axis slope
(Standardized) major axis estimation and testing for one or several sa...
(Standardised) Major Axis Estimation and Testing Routines
Print a summary
Methods for fitting bivariate lines in allometry using the major axis (MA) or standardised major axis (SMA), and for making inferences about such lines. The available methods of inference include confidence intervals and one-sample tests for slope and elevation, testing for a common slope or elevation amongst several allometric lines, constructing a confidence interval for a common slope or elevation, and testing for no shift along a common axis, amongst several samples. See Warton et al. 2012 <doi:10.1111/j.2041-210X.2011.00153.x> for methods description.