Frequencies for first 10,000 rows of shck_trma_srvc_cd variable in pos1996 dataset :

 srv: shock |
     trauma |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,803       88.03       88.03
          0 |      1,087       10.87       98.90
          1 |         84        0.84       99.74
          2 |         19        0.19       99.93
          3 |          7        0.07      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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