Nothing
lder2.grm <-
function( u, theta, params )
{
# Then turn params into a matrix and determine stats:
params <- rbind(params)
N <- length(theta)
J <- nrow(params)
K <- ncol(params)
## Calculating the probability of response: ##
p <- p.grm(theta, params)
## Calculating the first and second derivatives: ##
pder1 <- pder1.grm(theta, params)
pder2 <- pder2.grm(theta, params)
## Calculating two parts of second derivative: ##
lder2 <- ( -pder1^2 / p^2 ) + ( pder2 / p )
return( sel.prm(lder2, u, N, J, K) )
} # END lder2.grm FUNCTION
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