The function sets the default level occurrence of an attribute when a design is restricted to be attribute level balanced. If the design cannot be attribute level balanced, then the restriction will be relaxed for each attribute failing to meet this criteria. Specifically, the code will impose a minimum range of how often an attribute level can occur. This will secure that the design is near attribute level balanced. In this case a warning is issued.
An integer giving the number of levels for the considered attribute
Number of rows in the design
A named list of lists where the top level gives the attribute and the lower level gives the times or range each attribute level should occur in the design