Frequencies for first 10,000 rows of prov2435 variable in pos1998 dataset :

       srv: |
  radiology |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,416       94.16       94.16
          1 |        126        1.26       95.42
          2 |        450        4.50       99.92
          3 |          8        0.08      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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