Frequencies for first 10,000 rows of alcohol variable in nhamcsed2002 dataset :

     is visit related to alcohol use? |      Freq.     Percent        Cum.
--------------------------------------+-----------------------------------
                                Blank |        178        1.78        1.78
                   Yes, patient’s use |        322        3.22        5.00
              Yes, other person’s use |          6        0.06        5.06
                                   No |      8,320       83.20       88.26
                              Unknown |      1,168       11.68       99.94
Both patient`s and other person`s use |          6        0.06      100.00
--------------------------------------+-----------------------------------
                                Total |     10,000      100.00

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