Dear all: I try to use a data field which has just 5 values, 1, 2, 3, 4, 5. This field is a variable (e.g. resistance to drought). Also in the field there are some missing values, so I define the define the field as: drres !M0 Should I use the qualifier !I too ? Regards, Hermann -- Asreml mailinglist archive: http://www.chiswick.anprod.csiro.au/lists/asreml