Frequencies for first 10,000 rows of econds_4 variable in linkco1991us_num dataset :

Sequence of |
  condition |
     within |
part/line 4 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      7,755       77.55       77.55
          1 |      1,655       16.55       94.10
          2 |        511        5.11       99.21
          3 |         69        0.69       99.90
          4 |         10        0.10      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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