Frequencies for first 10,000 rows of ct_scan_srvc_cd variable in pos2010 dataset :

    SRV: CT |
    SCANNER |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,626       86.26       86.26
          0 |      1,040       10.40       96.66
          1 |        251        2.51       99.17
          2 |         61        0.61       99.78
          3 |         22        0.22      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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