A new multivariate concept of quantile, based on a directional version of Koenker and Bassett's traditional regression quantiles, is introduced for multivariate location and multiple-output regression ...

Journal of Vegetation Science, Vol. 20, No. 3 (Jun., 2009), pp. 547-556 (10 pages) Questions: Are soil seed banks affected by invasions of alien plants? How can we rigorously assess alterations in ...