Frequencies for first 10,000 rows of ct_scan_srvc_cd variable in pos2009 dataset :

    SRV: CT |
    SCANNER |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,638       86.38       86.38
          0 |      1,071       10.71       97.09
          1 |        220        2.20       99.29
          2 |         52        0.52       99.81
          3 |         19        0.19      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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