Frequencies for first 10,000 rows of shck_trma_srvc_cd variable in pos2003 dataset :

 srv: shock |
     trauma |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,789       87.89       87.89
          0 |      1,114       11.14       99.03
          1 |         66        0.66       99.69
          2 |         22        0.22       99.91
          3 |          9        0.09      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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