Frequencies for first 10,000 rows of prov2440 variable in pos2001 dataset :

       srv: |
  radiology |
(diagnostic |
          ) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,837       88.37       88.37
          0 |         19        0.19       88.56
          1 |        832        8.32       96.88
          2 |        201        2.01       98.89
          3 |        111        1.11      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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