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In database management an aggregate function is a function where the values of multiple rows are grouped together as input on certain criteria to form a single value of more significant meaning or measurement such as a set, a bag or a list. Common aggregate functions include : Average() (i.e., arithmetic mean)
Aggregate (data.frame): Technical Overview. Aggregate is a function in base R which can, as the name suggests, aggregate the inputted data.frame d.f by applying a function specified by the FUN parameter to each column of sub-data.frames defined by the by input parameter. The by parameter has to be a list.