Frequencies for versionnum variable in busrules2014 dataset :

    Version |
     Number |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         66        3.14        3.14
          2 |         74        3.52        6.66
          3 |        159        7.56       14.22
          4 |        282       13.41       27.63
          5 |        278       13.22       40.85
          6 |        389       18.50       59.34
          7 |        328       15.60       74.94
          8 |        262       12.46       87.40
          9 |        165        7.85       95.24
         10 |         44        2.09       97.34
         11 |         37        1.76       99.10
         12 |         12        0.57       99.67
         13 |          1        0.05       99.71
         14 |          5        0.24       99.95
         16 |          1        0.05      100.00
------------+-----------------------------------
      Total |      2,103      100.00

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