Nothing
ggompertz <- function(scale = 1, shape)
{
if ( (is.numeric(scale) == FALSE) || (is.numeric(shape) == FALSE) )
{
output <- NA
warning("objects 'scale' and 'shape' must be numeric")
}
else if ( (length(scale) != 1L) || (length(shape) != 1L) )
{
output <- NA
warning("objects 'scale' and 'shape' must have length 1")
}
else if ( (scale <= 0) || (shape <= 0) )
{
output <- NA
warning("objects 'scale' and 'shape' must be positive")
}
else
{
InnerFunc <- function(y)
{
y * VGAM::dgompertz(y, scale, shape)
}
InnerIntegral <- Vectorize(function(y) { stats::integrate(InnerFunc, 0, VGAM::qgompertz(y, scale, shape))$value})
Integral2 <- stats::integrate(InnerIntegral, 0, 1)
integral.MEAN <- stats::integrate(InnerFunc, lower = 0, upper = Inf)
mean.Gom <- integral.MEAN$value
output <- 2*(0.5 - (1/mean.Gom)*Integral2$value)
if((output<0)||(output>1))
{
output <- NA
warning("the selected parameters 'scale' and 'shape' give a Gini index out of the interval [0,1]")
}
}
return(output)
}
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