Frequencies for first 10,000 rows of chow_cnt variable in posclia2013 dataset :

 CHOW Count |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,964       99.64       99.64
          1 |         18        0.18       99.82
          2 |         13        0.13       99.95
          3 |          2        0.02       99.97
          4 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 26 Jan 2016