Frequencies for first 10,000 rows of foll_seq variable in demo2007q4 dataset :

        The |
   sequence |
number of a |
   followup |
     report |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,375       93.75       93.75
          1 |        450        4.50       98.25
         13 |          1        0.01       98.26
          2 |        104        1.04       99.30
          3 |         42        0.42       99.72
         35 |          1        0.01       99.73
          4 |         17        0.17       99.90
          5 |          6        0.06       99.96
          6 |          3        0.03       99.99
          9 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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