Frequencies for first 10,000 rows of chow_cnt variable in posclia2014 dataset :

 CHOW Count |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,975       99.75       99.75
          1 |         11        0.11       99.86
          2 |         11        0.11       99.97
          3 |          1        0.01       99.98
          4 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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