Frequencies for first 10,000 rows of prov0465 variable in pos1991 dataset :

experimenta |
 l research |
  conducted |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      7,078       70.78       70.78
          N |      2,825       28.25       99.03
          Y |         97        0.97      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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