Frequencies for first 10,000 rows of ob_srvc_cd variable in pos2014 dataset :

  Services: |
 Obstetrics |
       Code |      Freq.     Percent        Cum.
------------+-----------------------------------
          . |      8,592       85.92       85.92
          0 |        786        7.86       93.78
          1 |        544        5.44       99.22
          2 |         40        0.40       99.62
          3 |         38        0.38      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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