Frequencies for first 10,000 rows of segmentid variable in ma2016 dataset :

 Segment ID |      Freq.     Percent        Cum.
------------+-----------------------------------
          . |          1        0.01        0.01
          0 |      9,599       95.99       96.00
          1 |        164        1.64       97.64
          2 |        219        2.19       99.83
          3 |          5        0.05       99.88
          4 |          4        0.04       99.92
          5 |          4        0.04       99.96
          6 |          4        0.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org ,