wide
A logical, if TRUE the output data is generated in wide format, if FALSE, the output longitudinal data in generated in long format
LTCF
The name of the right-censoring / failure event indicator variable for the Last Time-point Carried Forward imputation. By default, when LTCF is left unspecified, all variables that follow after any end of follow-up (EFU) event are set to missing (NA). The