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