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

    related |
factors (2) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,983       99.83       99.83
         13 |          1        0.01       99.84
         99 |         16        0.16      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Oct 2016