Frequencies for first 10,000 rows of prov2445 variable in pos1995 dataset :

       srv: |
  radiology |
(therapeuti |
         c) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,933       89.33       89.33
          0 |        688        6.88       96.21
          1 |        212        2.12       98.33
          2 |        147        1.47       99.80
          3 |         20        0.20      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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