Frequencies for pvin_lngt variable in parkwork dataset :

 vin length |      Freq.     Percent        Cum.
------------+-----------------------------------
          6 |          2        0.18        0.18
          7 |          1        0.09        0.27
         10 |          2        0.18        0.46
         11 |          1        0.09        0.55
         12 |          1        0.09        0.64
         13 |          3        0.27        0.92
         17 |      1,043       95.60       96.52
          . |         38        3.48      100.00
------------+-----------------------------------
      Total |      1,091      100.00

by Jean Roth , jroth@nber.org , 22 Oct 2016