inibest: Preliminary estimators for CUB models without covariates
Description
Compute preliminary parameter estimates of a CUB model without covariates for given ordinal
responses. These preliminary estimators are used within the package code to start the E-M algorithm.
Usage
inibest(m,freq)
Value
A vector \((\pi,\xi)\) of the initial parameter estimates for a CUB model without covariates,
given the absolute frequency distribution of ordinal responses
Arguments
m
Number of ordinal categories
freq
Vector of the absolute frequencies of given ordinal responses
References
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