Frequencies for first 10,000 rows of prov2445 variable in pos2008 dataset :

       srv: |
  radiology |
(therapeuti |
         c) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,655       86.55       86.55
          0 |        865        8.65       95.20
          1 |        269        2.69       97.89
          2 |        160        1.60       99.49
          3 |         51        0.51      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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