Frequencies for first 10,000 rows of prov2435 variable in pos1993 dataset :

       srv: |
  radiology |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,608       96.08       96.08
          1 |         90        0.90       96.98
          2 |        297        2.97       99.95
          3 |          5        0.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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