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

 PROTECTION |
 SYSTEM USE |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      3,255       32.55       32.55
          1 |         35        0.35       32.90
          2 |        124        1.24       34.14
          3 |      5,098       50.98       85.12
          4 |        179        1.79       86.91
          5 |        450        4.50       91.41
          6 |          9        0.09       91.50
          8 |         27        0.27       91.77
         10 |         16        0.16       91.93
         11 |          6        0.06       91.99
         12 |          5        0.05       92.04
         13 |         11        0.11       92.15
         14 |         26        0.26       92.41
         15 |         13        0.13       92.54
         99 |        746        7.46      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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