cop_apstress | R Documentation |
This uses an approximation to power stress that can make use of smacof as workhorse. Free parameters are tau and upsilon.
cop_apstress( dis, theta = c(1, 1, 1), ndim = 2, weightmat = NULL, init = NULL, itmaxi = 1000, ..., stressweight = 1, cordweight = 0.5, q = 1, minpts = ndim + 1, epsilon = 10, rang = NULL, verbose = 0, normed = TRUE, scale = "sd", stresstype = "default" )
dis |
numeric matrix or dist object of a matrix of proximities |
theta |
the theta vector of parameters to optimize over. Must be of length two, with the first the tau argument and the second the upsilon argument. It can also be a scalar of the tau and upsilon transformation for the observed proximities and gets recycled for both ups and tau (so they are equal). Defaults to 1 1. |
ndim |
number of dimensions of the target space |
weightmat |
(optional) a binary matrix of nonnegative weights |
init |
(optional) initial configuration |
itmaxi |
number of iterations. default is 1000. |
... |
additional arguments to be passed to the fitting procedure |
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 ndim+1 |
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 extremely verbose |
normed |
should the cordillera be normed; defaults to TRUE |
scale |
should the configuration be scale adjusted |
stresstype |
which stress to report. Only takes smacofs default stress currrently. |
A list with the components
stress: the stress
stress.m: default normalized stress
copstress: the weighted loss value
OC: the Optics cordillera value
parameters: the parameters used for fitting (kappa, lambda)
fit: the returned object of the fitting procedure (which has all smacofB elements and some more
cordillera: the cordillera object
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