Frequencies for length variable in form2010 dataset :

     Format |
     length |      Freq.     Percent        Cum.
------------+-----------------------------------
          3 |          2        0.06        0.06
          7 |         12        0.35        0.41
          9 |         22        0.65        1.06
         12 |         71        2.08        3.14
         14 |         36        1.06        4.19
         15 |         90        2.64        6.83
         16 |         25        0.73        7.57
         17 |         16        0.47        8.04
         18 |        223        6.54       14.57
         19 |         26        0.76       15.34
         20 |        144        4.22       19.56
         21 |         80        2.35       21.91
         22 |          7        0.21       22.11
         23 |         25        0.73       22.84
         24 |          7        0.21       23.05
         25 |         11        0.32       23.37
         26 |         36        1.06       24.43
         27 |         23        0.67       25.10
         28 |         27        0.79       25.89
         29 |        102        2.99       28.89
         30 |         26        0.76       29.65
         31 |         19        0.56       30.21
         32 |         41        1.20       31.41
         33 |        233        6.83       38.24
         34 |         25        0.73       38.97
         35 |        159        4.66       43.64
         36 |         19        0.56       44.19
         37 |        112        3.28       47.48
         38 |         70        2.05       49.53
         39 |         26        0.76       50.29
         41 |          6        0.18       50.47
         42 |         21        0.62       51.09
         43 |          6        0.18       51.26
         45 |         17        0.50       51.76
         46 |        112        3.28       55.04
         47 |         16        0.47       55.51
         48 |         19        0.56       56.07
         49 |         10        0.29       56.36
         51 |         29        0.85       57.21
         52 |        496       14.55       71.76
         53 |         10        0.29       72.05
         54 |         42        1.23       73.28
         56 |         30        0.88       74.16
         57 |         18        0.53       74.69
         58 |         20        0.59       75.28
         60 |         65        1.91       77.18
         61 |         19        0.56       77.74
         62 |         99        2.90       80.65
         63 |         21        0.62       81.26
         64 |         55        1.61       82.87
         70 |         16        0.47       83.34
         71 |          4        0.12       83.46
         72 |          8        0.23       83.70
         75 |         29        0.85       84.55
         76 |         19        0.56       85.10
         86 |         10        0.29       85.40
         94 |         19        0.56       85.95
        100 |         65        1.91       87.86
        101 |         23        0.67       88.53
        112 |         12        0.35       88.89
        115 |         76        2.23       91.11
        121 |         20        0.59       91.70
        125 |        113        3.31       95.01
        133 |        170        4.99      100.00
------------+-----------------------------------
      Total |      3,410      100.00

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