inibestgama function

Preliminary parameter estimates of a CUB model with covariates for feeling

Compute preliminary parameter estimates for the feeling component of a CUB model fitted to ordinal responses These estimates are set as initial values for parameters to start the E-M algorithm.

inibestgama(m,ordinal,W)

Arguments

• m: Number of ordinal categories
• ordinal: Vector of ordinal responses
• W: Matrix of selected covariates for explaining the feeling component

Returns

A vector of length equal to NCOL(W)+1, whose entries are the preliminary estimates of the parameters for the feeling component, including an intercept term as first entry.

Examples

data(univer)
m<-7; ordinal<-univer$global; cov<-univer$diploma
ini<-inibestgama(m,ordinal,W=cov)

References

Iannario M. (2008). Selecting feeling covariates in rating surveys, Rivista di Statistica Applicata, 20 , 103--116

Iannario M. (2009). A comparison of preliminary estimators in a class of ordinal data models, Statistica & Applicazioni, VII , 25--44

Iannario M. (2012). Preliminary estimators for a mixture model of ordinal data, Advances in Data Analysis and Classification, 6 , 163--184

See Also

inibest, inibestcubecsi