Frequencies for first 10,000 rows of prov2440 variable in pos1995 dataset :

       srv: |
  radiology |
(diagnostic |
          ) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,933       89.33       89.33
          0 |         24        0.24       89.57
          1 |        794        7.94       97.51
          2 |        169        1.69       99.20
          3 |         80        0.80      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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