get_ntail: Values greater than or equal to xmin
In csgillespie/poweRlaw: Analysis of Heavy Tailed Distributions

Returns the number of data points greater than or equal to current value of xmin. In the Clauset et al, paper this is called 'ntail'.

1	get_ntail(m, prop = FALSE, lower = FALSE)

`m`	a distribution object.
`prop`	default `FALSE`. Return the value as a proportion of the total sample size
`lower`	default `FALSE`. If `TRUE` returns sample size - ntail

################################################
# Load data and create example object
################################################
data(moby_sample)
m = displ$new(moby_sample)
m$setXmin(7)
################################################
# Get ntail
################################################
get_ntail(m)
sum(moby_sample >= 7)