Frequencies for first 10,000 rows of econds_3 variable in linkco1991us_num dataset :

Sequence of |
  condition |
     within |
part/line 3 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      5,433       54.33       54.33
          1 |      3,948       39.48       93.81
          2 |        562        5.62       99.43
          3 |         57        0.57      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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