Frequencies for first 10,000 rows of nrsrgcl_srvc_cd variable in pos2008 dataset :

       srv: |
neurosurgic |
al services |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,655       86.55       86.55
          0 |      1,283       12.83       99.38
          1 |         47        0.47       99.85
          2 |         10        0.10       99.95
          3 |          5        0.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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