Frequencies for first 10,000 rows of nrsrgcl_srvc_cd variable in pos2007 dataset :

       srv: |
neurosurgic |
al services |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,682       86.82       86.82
          0 |      1,271       12.71       99.53
          1 |         34        0.34       99.87
          2 |         10        0.10       99.97
          3 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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