Frequencies for first 10,000 rows of prov2440 variable in pos1999 dataset :

       srv: |
  radiology |
(diagnostic |
          ) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,885       88.85       88.85
          0 |         19        0.19       89.04
          1 |        812        8.12       97.16
          2 |        188        1.88       99.04
          3 |         96        0.96      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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