Frequencies for first 10,000 rows of shck_trma_srvc_cd variable in pos2005 dataset :

srv: trauma |
     center |
(certified) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,731       87.31       87.31
          0 |      1,172       11.72       99.03
          1 |         65        0.65       99.68
          2 |         24        0.24       99.92
          3 |          8        0.08      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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