Frequencies for first 10,000 rows of ct_scan_srvc_cd variable in pos2008 dataset :

    srv: ct |
    scanner |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,655       86.55       86.55
          0 |      1,131       11.31       97.86
          1 |        165        1.65       99.51
          2 |         36        0.36       99.87
          3 |         13        0.13      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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