Frequencies for first 10,000 rows of segmentid variable in ma2014 dataset :

 Segment ID |      Freq.     Percent        Cum.
------------+-----------------------------------
          . |          4        0.04        0.04
          0 |      9,592       95.92       95.96
          1 |         91        0.91       96.87
          2 |         61        0.61       97.48
          3 |        144        1.44       98.92
          4 |         48        0.48       99.40
          5 |         39        0.39       99.79
          6 |         21        0.21      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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