Frequencies for first 10,000 rows of econdp_1 variable in linkco1991us_num dataset :

  Part/line |
  number on |
certificate |
          1 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      9,890       98.90       98.90
          2 |         97        0.97       99.87
          3 |          2        0.02       99.89
          6 |         11        0.11      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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