Frequencies for first 10,000 rows of NRSRGCL_SRVC_CD variable in pos2011 dataset :

   Services |
  Provided: |
Neurosurgic |
al Services |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,614       86.14       86.14
          0 |      1,267       12.67       98.81
          1 |         86        0.86       99.67
          2 |         18        0.18       99.85
          3 |         15        0.15      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 19 Apr 2019