Frequencies for first 10,000 rows of p_sf2 variable in person dataset :

    Related |
factors (2) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,950       99.50       99.50
         99 |         50        0.50      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2016