Frequencies for first 10,000 rows of shck_trma_srvc_cd variable in pos2009 dataset :

SRV: TRAUMA |
     CENTER |
(CERTIFIED) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,638       86.38       86.38
          0 |      1,257       12.57       98.95
          1 |         69        0.69       99.64
          2 |         24        0.24       99.88
          3 |         12        0.12      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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