Frequencies for per_no variable in safetyeq dataset :

     person |
     number |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      6,371       91.84       91.84
          2 |        389        5.61       97.45
          3 |         85        1.23       98.67
          4 |         38        0.55       99.22
          5 |         19        0.27       99.50
          6 |         12        0.17       99.67
          7 |          6        0.09       99.75
          8 |          4        0.06       99.81
          9 |          4        0.06       99.87
         10 |          2        0.03       99.90
         11 |          2        0.03       99.93
         12 |          1        0.01       99.94
         13 |          1        0.01       99.96
         14 |          1        0.01       99.97
         15 |          1        0.01       99.99
         16 |          1        0.01      100.00
------------+-----------------------------------
      Total |      6,937      100.00

by Jean Roth , jroth@nber.org , 22 Oct 2016