Frequencies for first 10,000 rows of prov2440 variable in pos1996 dataset :

       srv: |
  radiology |
(diagnostic |
          ) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,803       88.03       88.03
          0 |         23        0.23       88.26
          1 |        880        8.80       97.06
          2 |        199        1.99       99.05
          3 |         95        0.95      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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