Frequencies for first 10,000 rows of alcohol variable in natl2005 dataset :

Alcohol Use |
          U |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        212        2.12        2.12
          2 |      9,748       97.48       99.60
          9 |         40        0.40      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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