Frequencies for first 10,000 rows of prov2445 variable in pos1991 dataset :

       srv: |
  radiology |
(therapeuti |
         c) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,770       87.70       87.70
          0 |        782        7.82       95.52
          1 |        244        2.44       97.96
          2 |        186        1.86       99.82
          3 |         18        0.18      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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