Frequencies for first 10,000 rows of prov2445 variable in pos1996 dataset :

       srv: |
  radiology |
(therapeuti |
         c) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,803       88.03       88.03
          0 |        752        7.52       95.55
          1 |        256        2.56       98.11
          2 |        161        1.61       99.72
          3 |         28        0.28      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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