SccsData is an S4 class that inherits from Andromeda. It contains information on the cases and their covariates.
A SccsData is typically created using getDbSccsData(), can only be saved using
saveSccsData(), and loaded using loadSccsData().
# S4 method for class 'SccsData'
show(object)
# S4 method for class 'SccsData'
summary(object)