This is data simulated using the sim_pexp function.
It contains two time-constant and two time-dependent covariates (observed
on different exposure time grids). The code used for simulation is
contained in the examples of ?sim_pexp.
simdf_elraAn object of class nested_fdf (inherits from sim_df, tbl_df, tbl, data.frame) with 250 rows and 9 columns.