Frequencies for first 10,000 rows of aoi variable in vsoe dataset :

   Areas of |
     Impact |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      1,185       11.85       11.85
          1 |        129        1.29       13.14
          2 |         42        0.42       13.56
          3 |        121        1.21       14.77
          4 |         47        0.47       15.24
          5 |         42        0.42       15.66
          6 |        304        3.04       18.70
          7 |         45        0.45       19.15
          8 |         50        0.50       19.65
          9 |        170        1.70       21.35
         10 |         71        0.71       22.06
         11 |        165        1.65       23.71
         12 |      2,440       24.40       48.11
         13 |         50        0.50       48.61
         14 |        260        2.60       51.21
         18 |         79        0.79       52.00
         55 |      3,431       34.31       86.31
         61 |        170        1.70       88.01
         62 |         80        0.80       88.81
         63 |         38        0.38       89.19
         81 |        126        1.26       90.45
         82 |         61        0.61       91.06
         83 |         38        0.38       91.44
         98 |        495        4.95       96.39
         99 |        361        3.61      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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