Frequencies for first 10,000 rows of segmentid variable in ma2010 dataset :

 Segment ID |      Freq.     Percent        Cum.
------------+-----------------------------------
          . |          6        0.06        0.06
          0 |      8,894       88.94       89.00
          1 |        184        1.84       90.84
          2 |         64        0.64       91.48
          3 |        456        4.56       96.04
          4 |        172        1.72       97.76
          5 |        130        1.30       99.06
          6 |         88        0.88       99.94
          9 |          6        0.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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