Frequencies for first 10,000 rows of prov2240 variable in pos1993 dataset :

      spec: |
neurologica |
          l |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,608       96.08       96.08
          N |        327        3.27       99.35
          Y |         65        0.65      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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