Frequencies for first 10,000 rows of chow_cnt variable in posclia2015 dataset :

 CHOW Count |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,956       99.56       99.56
          1 |         18        0.18       99.74
          2 |         25        0.25       99.99
          3 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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