Hi, I am using the methods developped in the packages "statDA and mvoutliers" to detect multivariate outliers. I used the "plotmvoutlier" to detect the outliers. The only thing I don't understand is that the results given by the vector "w" from "arw" and "o" from "plotmvoutlier" are not the same (i.e. : w != o is not equal to true) Should they be the same or not (or just the opposite) for the same parameters? if not, what is the meaning of the "w" vector ? Here is an example of my code : rob <- covMcd(BoxCoxData, alpha = 0.75) xarw <- arw(BoxCoxData, rob$center,rob$cov, alpha = 0.01) mvOut <- plotmvoutlier(Coord,Data, quan=0.75, alpha=0.01, plotmap=FALSE) xarw$w == !mvOut$o Thanks. Francois Collienne Student in Agronomy Engineering UCL - Belgium francois.collienne@student.uclouvain.be [[alternative HTML version deleted]]