copstress {cops}

Calculates copstress for given MDS object

Description

Calculates copstress for given MDS object

Usage

copstress(
  obj,
  stressweight = 1,
  cordweight = 5,
  q = 1,
  minpts = 2,
  epsilon = 10,
  rang = NULL,
  verbose = 0,
  normed = TRUE,
  scale = c("std", "sd", "proc", "none"),
  init,
  ...
)

Arguments

obj

MDS object (supported are sammon, cmdscale, smacof, rstress, powermds)

stressweight

weight to be used for the fit measure; defaults to 1

cordweight

weight to be used for the cordillera; defaults to 0.5

q

the norm of the cordillera; defaults to 1

minpts

the minimum points to make up a cluster in OPTICS; defaults to 2

epsilon

the epsilon parameter of OPTICS, the neighbourhood that is checked; defaults to 10

rang

range of the distances (min distance minus max distance). If NULL (default) the cordillera will be normed to each configuration's maximum distance, so an absolute value of goodness-of-clusteredness.

verbose

numeric value hat prints information on the fitting process; >2 is very verbose (copstress level), >3 is extremely (up to MDS optimization level)

normed

should the cordillera be normed; defaults to TRUE

scale

should the configuration be scale adjusted.

init

a reference configuration when doing procrustes adjustment

...

additional arguments to be passed to the cordillera function

Value

A list with the components

• copstress: the weighted loss value

• OC: the Optics cordillera value

• parameters: the parameters used for fitting (kappa, lambda)

• cordillera: the cordillera object