Nothing
qtrunc <- function( p, spec, a = -Inf, b = Inf, ... )
{
###
### This function evaluates the inverse of the truncated distribution function
### or quantile function for the given vector of probabilities and
### the specified distribution
###
### Arguments
### p = a numeric vector of probabilities
### spec = a character value for the name of the distribution (e.g., "norm")
### ... = other arguments passed to the corresponding density function
###
if ( a >= b )
stop( "argument a is greater than or equal to b" )
tt <- p
G <- get( paste( "p", spec, sep="" ), mode = "function" )
Gin <- get( paste( "q", spec, sep="" ), mode = "function" )
G.a <- G( a, ... )
G.b <- G( b, ... )
if ( G.a == G.b ) {
stop( "Trunction interval is not inside the domain of the quantile function" )
}
result <- pmin( pmax( a, Gin( G( a, ... ) +
p * ( G( b, ... ) - G( a, ... )), ... ) ), b )
return( result )
}
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