Frequencies for first 10,000 rows of econds_10 variable in linkco1991us_num dataset :

Sequence of |
  condition |
     within |
  part/line |
         10 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,993       99.93       99.93
          5 |          2        0.02       99.95
          6 |          1        0.01       99.96
          7 |          4        0.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015