Nothing
lder2.brm <-
function( u, theta, params )
{
## Calculating the probability of response: ##
p <- p.brm(theta, params)
q <- 1 - p
## Calculating the first and second derivatives: ##
pder1 <- pder1.brm(theta, params)
pder2 <- pder2.brm(theta, params)
## Calculating two parts of second derivative: ##
lder2.1 <- ( -pder1^2 / p^2 ) + ( pder2 / p )
lder2.2 <- ( pder1^2 / q^2 ) + ( pder2 / q )
return( u * lder2.1 - (1 - u) * lder2.2 )
} # END lder2.brm FUNCTION
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