Frequencies for rownumber variable in busrules2016 dataset :

 Row Number |      Freq.     Percent        Cum.
------------+-----------------------------------
         10 |      6,755       76.77       76.77
         11 |        889       10.10       86.87
         12 |        351        3.99       90.86
         13 |        317        3.60       94.47
         14 |        123        1.40       95.86
         15 |        160        1.82       97.68
         16 |         57        0.65       98.33
         17 |         35        0.40       98.73
         18 |         30        0.34       99.07
         19 |         11        0.13       99.19
         20 |         12        0.14       99.33
         21 |         11        0.13       99.45
         22 |         12        0.14       99.59
         23 |          6        0.07       99.66
         24 |          5        0.06       99.72
         25 |          4        0.05       99.76
         26 |          4        0.05       99.81
         27 |          2        0.02       99.83
         28 |          2        0.02       99.85
         29 |          2        0.02       99.87
         30 |          2        0.02       99.90
         31 |          2        0.02       99.92
         32 |          2        0.02       99.94
         33 |          2        0.02       99.97
         34 |          1        0.01       99.98
         35 |          1        0.01       99.99
         36 |          1        0.01      100.00
------------+-----------------------------------
      Total |      8,799      100.00

by Jean Roth , jroth@nber.org , 6 Oct 2016