Frequencies for first 10,000 rows of prov2475 variable in pos2004 dataset :

 srv: shock |
     trauma |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,766       87.66       87.66
          0 |      1,141       11.41       99.07
          1 |         64        0.64       99.71
          2 |         22        0.22       99.93
          3 |          7        0.07      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 26 Jan 2016