analytical              A cross-nested design for an analytical method
                        investigation
concrete                A fractional factorial design for investigating
                        asphalt concrete production
dental                  A crossover design for a dental study
hasselayout             Hasse diagram of the layout structure
hasserls                Hasse diagram of the restricted layout
                        structure
human                   A block design for an experiment in
                        human-computer interaction
print.ls                Print and Summary Methods for '"ls"' Objects
