Frequencies for first 10,000 rows of prov2435 variable in pos1995 dataset :

       srv: |
  radiology |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,552       95.52       95.52
          1 |        107        1.07       96.59
          2 |        335        3.35       99.94
          3 |          6        0.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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