Frequencies for first 10,000 rows of shck_trma_srvc_cd variable in pos2000 dataset :

 srv: shock |
     trauma |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,871       88.71       88.71
          0 |      1,035       10.35       99.06
          1 |         68        0.68       99.74
          2 |         17        0.17       99.91
          3 |          9        0.09      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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