Return summary info for S3 object return by design function.
# S3 method for dropout
summary(object, ...)# S3 method for proportional
summary(object, ...)
# S3 method for interference
summary(object, ...)
A list of key info.
exact design and its repetitions
approximate design and its weights
computing time for approximate design
A S3 object of class 'dropout', 'proportional', or 'interference'.
other control parameters, but usually not necessary.
see examples in design.