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

 PROTECTION |
 SYSTEM USE |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      3,492       34.92       34.92
          1 |         40        0.40       35.32
          2 |        149        1.49       36.81
          3 |      4,705       47.05       83.86
          4 |        192        1.92       85.78
          5 |        336        3.36       89.14
          6 |         12        0.12       89.26
          8 |         24        0.24       89.50
         13 |          4        0.04       89.54
         14 |         22        0.22       89.76
         15 |          9        0.09       89.85
         99 |      1,015       10.15      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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