Frequencies for first 10,000 rows of chow_cnt variable in pos2015 dataset :

 CHOW Count |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      6,462       64.62       64.62
          1 |      1,454       14.54       79.16
          2 |        941        9.41       88.57
          3 |        400        4.00       92.57
          4 |        311        3.11       95.68
          5 |        179        1.79       97.47
          6 |        110        1.10       98.57
          7 |         66        0.66       99.23
          8 |         33        0.33       99.56
          9 |         15        0.15       99.71
         10 |         13        0.13       99.84
         11 |          6        0.06       99.90
         12 |          5        0.05       99.95
         13 |          3        0.03       99.98
         14 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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