Frequencies for first 10,000 rows of foll_seq variable in demo2010q1 dataset :

        The |
   sequence |
number of a |
   followup |
     report |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,919       99.19       99.19
          1 |         53        0.53       99.72
          2 |         16        0.16       99.88
         23 |          1        0.01       99.89
          3 |          2        0.02       99.91
          4 |          5        0.05       99.96
          5 |          2        0.02       99.98
          6 |          1        0.01       99.99
          8 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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