powered by
a cross-section
number of observations : 2412
observation : individuals
country : United States
data(Yogurt)
A dataframe containing :
individuals identifiers
one of yoplait, dannon, hiland, weight (weight watcher)
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/.