Frequencies for first 10,000 rows of prov2445 variable in pos2002 dataset :

       srv: |
  radiology |
(therapeuti |
         c) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,812       88.12       88.12
          0 |        760        7.60       95.72
          1 |        243        2.43       98.15
          2 |        150        1.50       99.65
          3 |         35        0.35      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 26 Jan 2016