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Here we learn about the different ways to work with relational data in R, using dplyr functions. Quoted from the book, the different types of thins you can perform are: “Mutating joins, which add new variables to one data frame from matching observations in another.”.

site. www .gfk .com. GfK (originally GfK-Nürnberg Gesellschaft für Konsumforschung e.V., 'Nuremberg Society for Consumer Research') is the largest German market research company. It provides data and intelligence to the consumer goods industry and is headquartered in Nuremberg, Germany ..