varcovcubshe: Variance-covariance matrix for CUB models with shelter effect

In CUB: A Class of Mixture Models for Ordinal Data

Description

Compute the variance-covariance matrix of parameter estimates of a CUB model with shelter effect.

Usage

varcovcubshe(m, pai1, pai2, csi, shelter, n)

Arguments

m	Number of ordinal categories
pai1	Parameter of the mixture distribution: mixing coefficient for the shifted Binomial component
pai2	Second parameter of the mixture distribution: mixing coefficient for the discrete Uniform component
csi	Feeling parameter
shelter	Category corresponding to the shelter choice
n	Number of observations

Details

The function checks if the variance-covariance matrix is positive-definite: if not, it returns a warning message and produces a matrix with NA entries.

References

Iannario, M. (2012), Modelling shelter choices in ordinal data surveys. Statistical Modelling and Applications, 21, 1–22

See Also

probcubshe1

CUB documentation built on March 31, 2020, 5:14 p.m.