Frequencies for first 10,000 rows of nrsrgcl_srvc_cd variable in pos2009 dataset :

       SRV: |
NEUROSURGIC |
AL SERVICES |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,638       86.38       86.38
          0 |      1,276       12.76       99.14
          1 |         64        0.64       99.78
          2 |         14        0.14       99.92
          3 |          8        0.08      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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