Frequencies for first 10,000 rows of xtrcrprl_shck_lthtrptr_srvc_cd variable in pos2016 dataset :

  Services: |
  ESWL Code |      Freq.     Percent        Cum.
------------+-----------------------------------
          . |      8,569       85.69       85.69
          0 |      1,236       12.36       98.05
          1 |         47        0.47       98.52
          2 |        101        1.01       99.53
          3 |         47        0.47      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 10 Jan 2017