Frequencies for first 10,000 rows of segmentid variable in planreport2011 dataset :

 Segment ID |      Freq.     Percent        Cum.
------------+-----------------------------------
          . |          6        0.06        0.06
          0 |      8,962       89.62       89.68
          1 |        103        1.03       90.71
          2 |         56        0.56       91.27
          3 |        456        4.56       95.83
          4 |        187        1.87       97.70
          5 |        130        1.30       99.00
          6 |         88        0.88       99.88
          9 |         12        0.12      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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