Frequencies for first 10,000 rows of prov2265 variable in pos1996 dataset :

       srv: |
 obstetrics |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,803       88.03       88.03
          0 |        553        5.53       93.56
          1 |        607        6.07       99.63
          2 |         29        0.29       99.92
          3 |          8        0.08      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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