Frequencies for first 10,000 rows of prov2475 variable in pos1997 dataset :

 srv: shock |
     trauma |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,792       87.92       87.92
          0 |      1,099       10.99       98.91
          1 |         82        0.82       99.73
          2 |         18        0.18       99.91
          3 |          9        0.09      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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