Frequencies for first 10,000 rows of segmentid variable in ma2013 dataset :

 Segment ID |      Freq.     Percent        Cum.
------------+-----------------------------------
          . |          4        0.04        0.04
          0 |      9,394       93.94       93.98
          1 |        108        1.08       95.06
          2 |         75        0.75       95.81
          3 |        236        2.36       98.17
          4 |         80        0.80       98.97
          5 |         65        0.65       99.62
          6 |         38        0.38      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 14 Apr 2016