Frequencies for first 10,000 rows of prov2440 variable in pos2003 dataset :

       srv: |
  radiology |
(diagnostic |
          ) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,789       87.89       87.89
          0 |         20        0.20       88.09
          1 |        844        8.44       96.53
          2 |        212        2.12       98.65
          3 |        135        1.35      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 17 May 2017