Frequencies for first 10,000 rows of prov2445 variable in pos2006 dataset :

       srv: |
  radiology |
(therapeuti |
         c) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,710       87.10       87.10
          0 |        827        8.27       95.37
          1 |        264        2.64       98.01
          2 |        155        1.55       99.56
          3 |         44        0.44      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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