4 quantiles of ya_prima
(rawsum) pondv
(min) ya_prima
(mean) y_prima
(mean) ya_prima
(mean) mtr_new
(mean) mtr_old
(mean) mtr_irnew
(mean) mtr_irold
(mean) iif
(mean) elast
(mean) d_workers
(mean) d_ya_prima
(mean) d_impots