Frequencies for first 10,000 rows of prov0465 variable in pos2010 dataset :

EXPERIMENTA |
 L RESEARCH |
  CONDUCTED |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,983       99.83       99.83
          Y |         17        0.17      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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