Frequencies for first 10,000 rows of ct_scan_srvc_cd variable in pos2007 dataset :

    srv: ct |
    scanner |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,682       86.82       86.82
          0 |      1,169       11.69       98.51
          1 |        125        1.25       99.76
          2 |         17        0.17       99.93
          3 |          7        0.07      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 17 May 2017