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

 two-letter |
abbrev. for |
state name. |      Freq.     Percent        Cum.
------------+-----------------------------------
         CT |        433        4.33        4.33
         DC |        278        2.78        7.11
         DE |         96        0.96        8.07
         MA |        690        6.90       14.97
         MD |        605        6.05       21.02
         ME |        486        4.86       25.88
         NH |        284        2.84       28.72
         NJ |        723        7.23       35.95
         NY |      2,158       21.58       57.53
         PA |      2,185       21.85       79.38
         PR |        176        1.76       81.14
         RI |         90        0.90       82.04
         VA |      1,216       12.16       94.20
         VI |         16        0.16       94.36
         VT |        309        3.09       97.45
         WV |        255        2.55      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/statecode.log | egre