Frequencies for first 10,000 rows of ob_srvc_cd variable in pos1992 dataset :

       srv: |
 obstetrics |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,851       88.51       88.51
          0 |        517        5.17       93.68
          1 |        595        5.95       99.63
          2 |         31        0.31       99.94
          3 |          6        0.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 17 May 2017