Frequencies for first 10,000 rows of ob_srvc_cd variable in pos2018 dataset :

  Services: |
 Obstetrics |
       Code |      Freq.     Percent        Cum.
------------+-----------------------------------
          . |      8,560       85.60       85.60
          0 |        813        8.13       93.73
          1 |        532        5.32       99.05
          2 |         40        0.40       99.45
          3 |         55        0.55      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 15 Feb 2019