S4 class SetOfSchemes representing a set of designs with given time points
.Data
a logical array of 3 dimensions ( nSubjects x nTimePoints x nSchemes )
timePoints
numeric vector of time Points
nSchemes
integer value number of schemes
nSubjects
numeric maximum number of subjects per scheme
designConstraints
a data.frame of constraints on possible sampling schemes as background information
ranking
is a data.frame which is the rank of the schemes according to a specific criterion