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

   zip code |
classificat |
   ion:p=po |
        box |
   u=unique |
   zip used |
  for large |
orgs/busine |
   sses/bld |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      7,043       70.43       70.43
          P |      2,149       21.49       91.92
          U |        808        8.08      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/zip_class.log | egre