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

   Zip Code |
classificat |
ion:M=APO/F |
         PO |
  P=P.O.Box |
   U=Unique |
Blank=Non-u |
      nique |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      7,010       70.10       70.10
          P |      2,051       20.51       90.61
          U |        939        9.39      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 4 Jan 2016
 tail -n+3 /homes/data/zip/sas/2003/desc/zipcode/byvar/tab/zip_class.log | egre