Frequencies for first 10,000 rows of ob_srvc_cd variable in pos2017 dataset :

  Services: |
 Obstetrics |
       Code |      Freq.     Percent        Cum.
------------+-----------------------------------
          . |      8,569       85.69       85.69
          0 |        803        8.03       93.72
          1 |        535        5.35       99.07
          2 |         41        0.41       99.48
          3 |         52        0.52      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 9 Jan 2018