Frequencies for first 10,000 rows of segmentid variable in ma2015 dataset :

 Segment ID |      Freq.     Percent        Cum.
------------+-----------------------------------
          . |          2        0.02        0.02
          0 |      9,704       97.04       97.06
          1 |         57        0.57       97.63
          2 |        153        1.53       99.16
          3 |         48        0.48       99.64
          4 |         16        0.16       99.80
          5 |         13        0.13       99.93
          6 |          7        0.07      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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