Frequencies for per_no variable in nmimpair dataset :

     person |
     number |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      5,802       91.04       91.04
          2 |        370        5.81       96.85
          3 |         89        1.40       98.24
          4 |         30        0.47       98.71
          5 |         16        0.25       98.96
          6 |         11        0.17       99.14
          7 |         10        0.16       99.29
          8 |          6        0.09       99.39
          9 |          6        0.09       99.48
         10 |          6        0.09       99.58
         11 |          5        0.08       99.65
         12 |          4        0.06       99.72
         13 |          4        0.06       99.78
         14 |          3        0.05       99.83
         15 |          3        0.05       99.87
         16 |          2        0.03       99.91
         17 |          2        0.03       99.94
         18 |          1        0.02       99.95
         19 |          1        0.02       99.97
         20 |          1        0.02       99.98
         21 |          1        0.02      100.00
------------+-----------------------------------
      Total |      6,373      100.00

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