Frequencies for max variable in form2007 dataset :

    Maximum |
     length |      Freq.     Percent        Cum.
------------+-----------------------------------
          3 |          2        0.05        0.05
          7 |          9        0.21        0.26
          8 |          3        0.07        0.33
          9 |         13        0.31        0.64
         10 |          4        0.10        0.74
         11 |          8        0.19        0.93
         12 |         22        0.52        1.45
         13 |         24        0.57        2.02
         14 |         94        2.24        4.26
         15 |        124        2.95        7.21
         16 |      1,363       32.44       39.65
         17 |        163        3.88       43.53
         18 |         39        0.93       44.46
         20 |         44        1.05       45.50
         21 |         20        0.48       45.98
         22 |        209        4.97       50.95
         23 |         93        2.21       53.17
         24 |         49        1.17       54.33
         26 |         12        0.29       54.62
         28 |         91        2.17       56.78
         35 |      1,425       33.91       90.69
         39 |          9        0.21       90.91
         40 |        367        8.73       99.64
         42 |         15        0.36      100.00
------------+-----------------------------------
      Total |      4,202      100.00

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