Frequencies for per_no variable in nmimpair dataset :

     person |
     number |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      5,634       91.76       91.76
          2 |        373        6.07       97.83
          3 |         82        1.34       99.17
          4 |         31        0.50       99.67
          5 |         10        0.16       99.84
          6 |          3        0.05       99.89
          7 |          3        0.05       99.93
          8 |          2        0.03       99.97
          9 |          2        0.03      100.00
------------+-----------------------------------
      Total |      6,140      100.00

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