Frequencies for first 10,000 rows of prov2265 variable in pos2001 dataset :

       srv: |
 obstetrics |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,837       88.37       88.37
          0 |        574        5.74       94.11
          1 |        546        5.46       99.57
          2 |         32        0.32       99.89
          3 |         11        0.11      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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