Frequencies for first 10,000 rows of prov2435 variable in pos1996 dataset :

       srv: |
  radiology |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,497       94.97       94.97
          1 |        113        1.13       96.10
          2 |        383        3.83       99.93
          3 |          7        0.07      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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