Frequencies for first 10,000 rows of prov2445 variable in pos2001 dataset :

       srv: |
  radiology |
(therapeuti |
         c) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,837       88.37       88.37
          0 |        740        7.40       95.77
          1 |        237        2.37       98.14
          2 |        156        1.56       99.70
          3 |         30        0.30      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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