Frequencies for first 10,000 rows of prov2445 variable in pos1993 dataset :

       srv: |
  radiology |
(therapeuti |
         c) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,856       88.56       88.56
          0 |        735        7.35       95.91
          1 |        238        2.38       98.29
          2 |        150        1.50       99.79
          3 |         21        0.21      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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