M -quantiles
M 分位数
It is well known that a M-estimator of the centre of symmetry Θ of a symmetric distribution can be defined in terms of either a continuous symmetric loss function ρ or the associated influence functionψ. This estimator is robust if ψ is bounded. In this paper, we develop a generalization of the M-concept to estimation of a quantile analogue of Θ, called a M-quantile, by introducing a particular kind of asymmetry into ψ. A natural consequence is that the M- quantile parameter…