Frequencies for versionnum variable in busrules2016 dataset :

    Version |
     Number |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        220        2.50        2.50
          2 |        564        6.41        8.91
          3 |      1,052       11.96       20.87
          4 |        889       10.10       30.97
          5 |        806        9.16       40.13
          6 |        761        8.65       48.78
          7 |        864        9.82       58.60
          8 |        808        9.18       67.78
          9 |        788        8.96       76.74
         10 |        459        5.22       81.95
         11 |        302        3.43       85.38
         12 |        307        3.49       88.87
         13 |        114        1.30       90.17
         14 |        181        2.06       92.23
         15 |        126        1.43       93.66
         16 |         19        0.22       93.87
         17 |        179        2.03       95.91
         27 |        272        3.09       99.00
         29 |         88        1.00      100.00
------------+-----------------------------------
      Total |      8,799      100.00

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