Frequencies for first 10,000 rows of foll_seq variable in demo2009q4 dataset :

        The |
   sequence |
number of a |
   followup |
     report |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,803       98.03       98.03
          1 |        120        1.20       99.23
         13 |          1        0.01       99.24
          2 |         45        0.45       99.69
          3 |         13        0.13       99.82
          4 |          9        0.09       99.91
          5 |          4        0.04       99.95
          6 |          2        0.02       99.97
          7 |          1        0.01       99.98
          8 |          1        0.01       99.99
          9 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Dec 2015