Frequencies for first 10,000 rows of prov0560 variable in pos1991 dataset :

        hha |
  qualified |
    for opt |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,733       87.33       87.33
          N |      1,140       11.40       98.73
          Y |        127        1.27      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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