immutable QQPair
	qx::Vector{Float64}
	qy::Vector{Float64}
end

function qqbuild(x::Vector, y::Vector)
	n = min(length(x), length(y))
	grid = [0.0:(1 / (n - 1)):1.0;]
	qx = quantile(x, grid)
	qy = quantile(y, grid)
	return QQPair(qx, qy)
end

function qqbuild(x::Vector, d::UnivariateDistribution)
	n = length(x)
	grid = [(1 / (n - 1)):(1 / (n - 1)):(1.0 - (1 / (n - 1)));]
	qx = quantile(x, grid)
	qd = quantile(d, grid)
	return QQPair(qx, qd)
end

function qqbuild(d::UnivariateDistribution, x::Vector)
	n = length(x)
	grid = [(1 / (n - 1)):(1 / (n - 1)):(1.0 - (1 / (n - 1)));]
	qd = quantile(d, grid)
	qx = quantile(x, grid)
	return QQPair(qd, qx)
end
