Frequencies for first 10,000 rows of prov2440 variable in pos2002 dataset :

       srv: |
  radiology |
(diagnostic |
          ) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,812       88.12       88.12
          0 |         20        0.20       88.32
          1 |        845        8.45       96.77
          2 |        204        2.04       98.81
          3 |        119        1.19      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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