update_U_ranked function

Update latent utility vector in the ranked probit case

This function updates the latent utility vector in the ranked probit case.

update_U_ranked(U, sys, Sigmainv)

Arguments

• U: The current utility vector of length J-1, differenced such that the vector is negative.
• sys: A vector of length J-1, the systematic utility part.
• Sigmainv: The inverted error term covariance matrix of dimension J-1 x J-1.

Returns

An updated utility vector of length J-1.

Details

This update is basically the same as in the non-ranked case, despite that the truncation point is zero.

Examples

U <- c(0,0)
sys <- c(0,0)
Sigmainv <- diag(2)
update_U_ranked(U, sys, Sigmainv)