Frequencies for first 10,000 rows of timezone variable in zipcode dataset :

  time zone |
    for zip |
      code. |      Freq.     Percent        Cum.
------------+-----------------------------------
   Atlantic |        192        1.92        1.92
    Eastern |      9,808       98.08      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 4 Jan 2016
 tail -n+3 /homes/data/zip/sas/2013/desc/zipcode/byvar/tab/timezone.log | egrep