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

 Two-letter |
abbrev. for |
state name. |      Freq.     Percent        Cum.
------------+-----------------------------------
         AK |          1        0.01        0.01
         CO |          1        0.01        0.02
         CT |        435        4.35        4.37
         DC |        275        2.75        7.12
         DE |         98        0.98        8.10
         FL |          1        0.01        8.11
         FM |          1        0.01        8.12
         HI |          1        0.01        8.13
         MA |        745        7.45       15.58
         MD |        618        6.18       21.76
         ME |        505        5.05       26.81
         MH |          1        0.01       26.82
         MP |          1        0.01       26.83
         NH |        278        2.78       29.61
         NJ |        734        7.34       36.95
         NY |      2,238       22.38       59.33
         PA |      2,224       22.24       81.57
         PR |        176        1.76       83.33
         PW |          1        0.01       83.34
         RI |         91        0.91       84.25
         VA |      1,251       12.51       96.76
         VI |         16        0.16       96.92
         VT |        308        3.08      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/statecode.log | egre