Frequencies for first 10,000 rows of segmentid variable in planreport2009 dataset :

 Segment ID |      Freq.     Percent        Cum.
------------+-----------------------------------
          . |          6        0.06        0.06
          0 |      8,892       88.92       88.98
          1 |        208        2.08       91.06
          2 |         44        0.44       91.50
          3 |        472        4.72       96.22
          4 |        160        1.60       97.82
          5 |        130        1.30       99.12
          6 |         88        0.88      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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