Frequencies for first 10,000 rows of prov2265 variable in pos1998 dataset :

       srv: |
 obstetrics |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,805       88.05       88.05
          0 |        550        5.50       93.55
          1 |        607        6.07       99.62
          2 |         28        0.28       99.90
          3 |         10        0.10      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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