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

Special Use |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,161       91.61       91.61
          1 |          4        0.04       91.65
          3 |          1        0.01       91.66
          5 |         20        0.20       91.86
          6 |          3        0.03       91.89
          7 |          2        0.02       91.91
          9 |         33        0.33       92.24
          . |        776        7.76      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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