Frequencies for first 10,000 rows of prov2475 variable in pos1995 dataset :

 srv: shock |
     trauma |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,933       89.33       89.33
          0 |        976        9.76       99.09
          1 |         67        0.67       99.76
          2 |         18        0.18       99.94
          3 |          6        0.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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