Frequencies for first 10,000 rows of skincanc variable in nhamcsopd1997 dataset :

skin cancer |
 prevention |
 couns/educ |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,980       99.80       99.80
          1 |         20        0.20      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016