Frequencies for first 10,000 rows of ob_srvc_cd variable in pos2015 dataset :

  Services: |
 Obstetrics |
       Code |      Freq.     Percent        Cum.
------------+-----------------------------------
          . |      8,580       85.80       85.80
          0 |        796        7.96       93.76
          1 |        541        5.41       99.17
          2 |         40        0.40       99.57
          3 |         43        0.43      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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