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

  Services: |
  ESWL Code |      Freq.     Percent        Cum.
------------+-----------------------------------
          . |      8,560       85.60       85.60
          0 |      1,228       12.28       97.88
          1 |         49        0.49       98.37
          2 |        110        1.10       99.47
          3 |         53        0.53      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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