A bivariate data set obtained from three normal bivariate distributions with different scales and proportions 1:2:2. One of the components is very overlapped with another one. A 10% background noise is added uniformly distributed in a rectangle containing the three normal components and not very overlapped with the three mixture components. A precise description of the M5 data set can be found in Garc<ed>a-Escudero et al. (2008).
M5data
The first two columns are the two variables. The last column is the true classification vector where symbol "0" stands for the contaminating data points.