Frequencies for first 10,000 rows of prov6215 variable in pos2006 dataset :

       srv: |
neurosurgic |
al services |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,710       87.10       87.10
          0 |      1,256       12.56       99.66
          1 |         27        0.27       99.93
          2 |          4        0.04       99.97
          3 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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