stop_powerelastic function

STOPS version of elastic scaling with powers for proximities and distances

This is power stress with free kappa and lambda but rho is fixed to -2 and the weights are delta.

stop_powerelastic(
  dis,
  theta = c(1, 1),
  type = "ratio",
  weightmat = 1 - diag(nrow(dis)),
  init = NULL,
  ndim = 2,
  itmaxi = 1e+05,
  ...,
  stressweight = 1,
  structures = c("cclusteredness", "clinearity", "cdependence", "cmanifoldness",
    "cassociation", "cnonmonotonicity", "cfunctionality", "ccomplexity", "cfaithfulness",
    "cregularity", "chierarchy", "cconvexity", "cstriatedness", "coutlying",
    "cskinniness", "csparsity", "cstringiness", "cclumpiness", "cinequality"),
  strucweight = rep(1/length(structures), length(structures)),
  strucpars,
  verbose = 0,
  stoptype = c("additive", "multiplicative"),
  registry = struc_reg
)

Arguments

• dis: numeric matrix or dist object of a matrix of proximities
• theta: the theta vector of powers; a vector of length two where the first element is kappa (for the fitted distances), the second lambda (for the observed proximities). If a scalar for the free parameters is given it is recycled. Defaults to 1 1.
• type: MDS type. Defaults to "ratio".
• weightmat: (optional) a matrix of nonnegative weights
• init: (optional) initial configuration
• ndim: number of dimensions of the target space
• itmaxi: number of iterations
• ...: additional arguments to be passed to the fitting procedure
• stressweight: weight to be used for the fit measure; defaults to 1
• structures: which strcutures to look for
• strucweight: weight to be used for the structures; defaults to 0.5
• strucpars: a list of parameters for the structuredness indices; each list element corresponds to one index in the order of the appeacrance in structures
• verbose: numeric value hat prints information on the fitting process; >2 is extremely verbose
• stoptype: which weighting to be used in the multi-objective optimization? Either 'additive' (default) or 'multiplicative'.
• registry: registry object with c-structuredness indices.

Returns

A list with the components

• stress: the stress-1 value
• stress.m: default normalized stress
• stoploss: the weighted loss value
• struc: the structuredness indices
• parameters: the parameters used for fitting (kappa, lambda)
• fit: the returned object of the fitting procedure
• stopobj: the stopobj object