Frequencies for first 10,000 rows of prov2435 variable in pos2004 dataset :

       srv: |
  radiology |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,098       90.98       90.98
          1 |        167        1.67       92.65
          2 |        712        7.12       99.77
          3 |         23        0.23      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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