A: This menu item can be used to apply the currently highlighted attribute/s in the Attribute Manager to those samples which contain valid data entries in all of the selected columns.  For example, if you wish to show those samples that are multivariate in Cu, Pb, Zn:

  1.         Choose Cu, Pb, Zn variables in the Select Variables dialog
  2.         Add a new red colour attribute in the Attribute Manager and make sure it is selected (the line will be blue and the title bar will say “New Colour”)
  3.         Click on the Validate>Apply attributes to all rows (selected data not null) menu option. Only those samples with valid Cu, Pb and Zn values in them will be coloured red in the plot windows and in the tabular data view.