a cross-section
number of observations : 3292
observation : individuals
country : United States
data(Cracker)
A dataframe containing :
individuals identifiers
one of sunshine, keebler, nabisco, private
is there a display for brand z ?
is there a newspaper feature advertisement for brand z ?
price of brand z
Journal of Business Economics and Statistics web site : http://www.amstat.org/publications/jbes/.