Frequencies for first 10,000 rows of prov2440 variable in pos2005 dataset :

       srv: |
  radiology |
(diagnostic |
          ) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,731       87.31       87.31
          0 |         35        0.35       87.66
          1 |        877        8.77       96.43
          2 |        215        2.15       98.58
          3 |        142        1.42      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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