Frequencies for first 10,000 rows of segmentid variable in snp2009 dataset :

 Segment ID |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,984       99.84       99.84
          1 |         10        0.10       99.94
          2 |          4        0.04       99.98
          3 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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