varcovcubp0 {CUB} | R Documentation |
Compute the variance-covariance matrix of parameter estimates of a CUB model with covariates for the uncertainty component.
varcovcubp0(m, ordinal, Y, bet, csi)
m |
Number of ordinal categories |
ordinal |
Vector of ordinal responses |
Y |
Matrix of covariates for explaining the uncertainty parameter |
bet |
Vector of parameters for the uncertainty component, whose length equals NCOL(Y)+1 to include an intercept term (first entry) |
csi |
Feeling parameter |
The function checks if the variance-covariance matrix is positive-definite: if not, it returns a warning message and produces a matrix with NA entries.
Piccolo D. (2006), Observed Information Matrix for CUB Models, Quaderni di Statistica, 8, 33–78