procrustes.jackknife: Examine the influence of each landmark in Procrustes...

In aphanotus/borealis: Tools for reproducible geometric morphometric analysis

Examine the influence of each landmark in Procrustes alignment using jackknife re-sampling

Description

The function will remove each landmark in turn and conduct generalized Procrustes analysis, then determine the distribution of pairwise Procrustes distances between all shapes.

Usage

procrustes.jackknife(
  A,
  curves = NULL,
  show.plot = TRUE,
  links = NULL,
  verbose = TRUE,
  ...
)

Arguments

A	A list or 3-dimensional array containing XY shape coordinates for multiple specimens.
curves	An optional matrix defining which landmarks should be treated as semilandmarks by gpagen.
show.plot	A logical argument specifying whether to display a plot of the median Procrustes distances, dropping each landmark.
links	A matrix with two columns indicating landmarks to connect by lines.
verbose	A logical argument specifying whether to display the function's progress.

Value

The median, 0.05 and 0.95 quantiles are returned as a data frame. Relatively lower values will be indicative of landmarks vary more than others. Exercise caution in the interpretation of these results. Variation may be biologically meaningful or may suggest systematic error in the placement of the landmarks.

Source

Dave Angelini [e-mail] [aut, cre]

Examples

procrustes.jackknife(Bombus.forewings)
procrustes.jackknife(Bombus.forewings, links = "chull")

aphanotus/borealis documentation built on Nov. 4, 2022, 8:44 p.m.