IdtSNgenda-class {MAINT.Data}

Class "IdtSNgenda"

Description

IdtSNgenda contains the results of discriminant analysis for the interval data, based on a general Skew-Normal model.

Slots

prior:

Prior probabilities of class membership; if unspecified, the class proportions for the training set are used; if present, the probabilities should be specified in the order of the factor levels.

ksi:

Matrix with the direct location parameter ("ksi") estimates for each group.

eta:

Matrix with the direct scaled sekwness parameter ("eta") estimates for each group.

scaling:

For each group g, scaling[,,g] is a matrix which transforms interval-valued observations so that in each group the scale-association matrix ("Omega") is spherical.

mu:

Matrix with the centred location parameter ("mu") estimates for each group.

gamma1:

Matrix with the centred sekwness parameter ("gamma1") estimates for each group.

ldet:

Vector of half log determinants of the dispersion matrix.

lev:

Levels of the grouping factor.

CovCase:

Configuration case of the variance-covariance matrix: Case 1 through Case 4

Methods

predict

signature(object = "IdtSNgenda"): Classifies interval-valued observations in conjunction with snda.

show

signature(object = "IdtSNgenda"): show S4 method for the IdtSNgenda-class

CovCase

signature(object = "IdtSNgenda"): Returns the configuration case of the variance-covariance matrix

Author(s)

Pedro Duarte Silva <[e-mail]>
Paula Brito <mpbrito.fep.up.pt>

References

Azzalini, A. and Dalla Valle, A. (1996), The multivariate skew-normal distribution. Biometrika 83(4), 715–726.

Brito, P., Duarte Silva, A. P. (2012), Modelling Interval Data with Normal and Skew-Normal Distributions. Journal of Applied Statistics 39(1), 3–20.

Duarte Silva, A.P. and Brito, P. (2015), Discriminant analysis of interval data: An assessment of parametric and distance-based approaches. Journal of Classification 39(3), 516–541.

See Also

MANOVA, snda, IData