Frequencies for first 10,000 rows of hha_qlfyd_opt_spch_sw variable in pos2009 dataset :

        HHA |
  QUALIFIED |
    FOR OPT |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,205       82.05       82.05
          N |      1,260       12.60       94.65
          Y |        535        5.35      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 17 May 2017