Frequencies for first 10,000 rows of prov2440 variable in pos2010 dataset :

       SRV: |
  RADIOLOGY |
(DIAGNOSTIC |
          ) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,626       86.26       86.26
          0 |         64        0.64       86.90
          1 |        912        9.12       96.02
          2 |        230        2.30       98.32
          3 |        168        1.68      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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