Auxiliary function for the log-likelihood estimation of IHG models with covariates

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Description

Compute the opposite of the log-likelihood function for an IHG model with covariates for the preference parameter.

Usage

1
effeihgcov(nu, ordinal, U, m)

Arguments

nu

Vector of the starting values for the parameters to be estimated, with length equal to NCOL(U)+1 to account for an intercept term (first entry of nu)

ordinal

Vector of ordinal responses

U

Matrix of the explanatory variables for the preference parameter θ

m

Number of ordinal categories

Details

It is called as an argument for "optim" within IHG function (with covariates) as the function to minimize.

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