Frequencies for first 10,000 rows of prov2445 variable in pos1999 dataset :

       srv: |
  radiology |
(therapeuti |
         c) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,885       88.85       88.85
          0 |        709        7.09       95.94
          1 |        233        2.33       98.27
          2 |        150        1.50       99.77
          3 |         23        0.23      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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