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

  Services: |
    CT Scan |
       Code |      Freq.     Percent        Cum.
------------+-----------------------------------
          . |      8,560       85.60       85.60
          0 |        876        8.76       94.36
          1 |        427        4.27       98.63
          2 |         84        0.84       99.47
          3 |         53        0.53      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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