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

       SRV: |
NEUROSURGIC |
AL SERVICES |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,626       86.26       86.26
          0 |      1,273       12.73       98.99
          1 |         72        0.72       99.71
          2 |         17        0.17       99.88
          3 |         12        0.12      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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