Frequencies for first 10,000 rows of prov2265 variable in pos1993 dataset :

       srv: |
 obstetrics |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,856       88.56       88.56
          0 |        505        5.05       93.61
          1 |        604        6.04       99.65
          2 |         29        0.29       99.94
          3 |          6        0.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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