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

Special Use |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,180       91.80       91.80
          1 |          3        0.03       91.83
          3 |         11        0.11       91.94
          4 |          6        0.06       92.00
          5 |         17        0.17       92.17
          6 |          5        0.05       92.22
          7 |          4        0.04       92.26
          9 |         51        0.51       92.77
          . |        723        7.23      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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