Frequencies for first 10,000 rows of segmentid variable in ma2017 dataset :

 Segment ID |      Freq.     Percent        Cum.
------------+-----------------------------------
          . |          2        0.02        0.02
          0 |      9,467       94.67       94.69
          1 |        211        2.11       96.80
          2 |        250        2.50       99.30
          3 |         24        0.24       99.54
          4 |         21        0.21       99.75
          5 |         20        0.20       99.95
          6 |          5        0.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org ,