Frequencies for first 10,000 rows of prov2445 variable in pos1998 dataset :

       srv: |
  radiology |
(therapeuti |
         c) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,805       88.05       88.05
          0 |        746        7.46       95.51
          1 |        261        2.61       98.12
          2 |        158        1.58       99.70
          3 |         30        0.30      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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