Frequencies for first 10,000 rows of prov2240 variable in pos1994 dataset :

      spec: |
neurologica |
          l |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,575       95.75       95.75
          N |        358        3.58       99.33
          Y |         67        0.67      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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