Frequencies for first 10,000 rows of prov2435 variable in pos1991 dataset :

       srv: |
  radiology |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,683       96.83       96.83
          1 |         67        0.67       97.50
          2 |        245        2.45       99.95
          3 |          5        0.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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