This data set is simulated data from two normal mixture distrbutions, mimicking a flow cytometry data set. It contains 10000 observations from an HIV+ patient and 10000 observations an HIV- patient.
data(quasiflow)quasiflow is a matrix with 6 columns and 20000 rows.
  Each row corresponds to measurements for one cell.
  The first 5 columns are flow cytometric measurements and the sixth
  column is a binary indicator, with 1 = HIV+ and -1 = HIV-.