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a cross-section
number of observations : 13705
observation : individuals
country : United States
data(Tuna)
A dataframe containing :
individuals identifiers
purchase identifiers
one of skw (Starkist water), cosw (Chicken of the sea water), pw (store--specific private label water), sko (Starkist oil), coso (Chicken of the sea oil)
price of brand z
Journal of Business Economics and Statistics web site : http://www.amstat.org/publications/jbes/.