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

 PROTECTION |
 SYSTEM USE |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      3,519       35.19       35.19
          1 |         41        0.41       35.60
          2 |        123        1.23       36.83
          3 |      4,786       47.86       84.69
          4 |        176        1.76       86.45
          5 |        484        4.84       91.29
          6 |          7        0.07       91.36
          8 |         14        0.14       91.50
         10 |         14        0.14       91.64
         11 |          1        0.01       91.65
         12 |          4        0.04       91.69
         13 |          9        0.09       91.78
         14 |         13        0.13       91.91
         15 |         11        0.11       92.02
         99 |        798        7.98      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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