Management of data for longitudinal submodel
data.time(data.id, Time, formFixed, formRandom, timeVar)
A list with the following components
Xtime
a matrix of fixed effects at each time of measure
Utime
a matrix of random effects at each time of measure
A dataframe
A vector of Time of events
A formula for the fixed effects of the longitudinal submodel
A formula for the random effects of the longitudinal submodel
The name of the column of time in data.id. This variable must appears in data.id