Frequencies for first 10,000 rows of prov2240 variable in pos2004 dataset :

      spec: |
neurologica |
          l |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,098       90.98       90.98
          N |        792        7.92       98.90
          Y |        110        1.10      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 26 Jan 2016