Frequencies for first 10,000 rows of prov2265 variable in pos1997 dataset :

       srv: |
 obstetrics |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,792       87.92       87.92
          0 |        563        5.63       93.55
          1 |        607        6.07       99.62
          2 |         29        0.29       99.91
          3 |          9        0.09      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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