Frequencies for first 10,000 rows of shck_trma_srvc_cd variable in pos1994 dataset :

 srv: shock |
     trauma |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,940       89.40       89.40
          0 |        968        9.68       99.08
          1 |         69        0.69       99.77
          2 |         18        0.18       99.95
          3 |          5        0.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 17 May 2017