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

      SPEC: |
NEUROLOGICA |
          L |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,644       96.44       96.44
          N |        310        3.10       99.54
          Y |         46        0.46      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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