Factor Names
Optionally, specify names for the factors. In the example, you are creating a design with three variables, with two levels of the first variable and three levels for the second and third variables. The syntax for this field is
c("variable one factor name one", "variable one factor name two"), c("variable two factor name one", "variable two factor name two", "variable two factor name three"), c("variable two factor name one", "variable two factor name two", "variable two factor name three")
Use the Zoom feature to make editing this field easier. Right-click on the field, and choose Zoom. In the Zoom edit box, type the factor names as described, and click OK.
If factor names are not given, they default to A, B, etc. If levels are not given, they default to the factor name (possibly abbreviated) followed by level numbers.