Frequencies for first 10,000 rows of ct_scan_srvc_cd variable in pos2005 dataset :

    srv: ct |
    scanner |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,731       87.31       87.31
          0 |      1,231       12.31       99.62
          1 |         33        0.33       99.95
          2 |          4        0.04       99.99
          3 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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