Frequencies for chainzip variable in hcris2552_96_2004 dataset :

   chainzip |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      6,244       99.66       99.66
      49048 |          1        0.02       99.68
 63145-5998 |          1        0.02       99.70
      70809 |          1        0.02       99.71
      75024 |          2        0.03       99.74
      75038 |          4        0.06       99.81
      75201 |          2        0.03       99.84
      75203 |          2        0.03       99.87
      75701 |          1        0.02       99.89
      77054 |          1        0.02       99.90
 77054-2904 |          1        0.02       99.92
      77074 |          1        0.02       99.94
      78705 |          1        0.02       99.95
      87109 |          2        0.03       99.98
      90806 |          1        0.02      100.00
------------+-----------------------------------
      Total |      6,265      100.00

by Jean Roth , jroth@nber.org , 9 Sep 2018