Frequencies for first 10,000 rows of prov2475 variable in pos1991 dataset :

 srv: shock |
     trauma |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,770       87.70       87.70
          0 |      1,086       10.86       98.56
          1 |        108        1.08       99.64
          2 |         30        0.30       99.94
          3 |          6        0.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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