effeihgcov function

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

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

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 $\theta$
• m: Number of ordinal categories

Details

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