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this video explains how to sum duplicate rows in the r programming language so without too much talk lets dive into the r code in this video i will show you two examples and both of these examples are based on the data frame that we can create with lines two and three of the code so if you run these lines of code you can see at the top right of our studio that a new data frame object is appearing which is called data and if you click on this data set a new window is opened which is showing the structure of our data frame and as you can see our data contains six rows and two columns which are called x1 and x2 and the first column x1 contains duplicates so lets assume that we want to sum the values in the column x2 based on the duplicates in the column x1 then we can apply the aggregate function as you can see in line 5 of the code and within the aggregate function we need to specify the column containing the values that we want to sum and then we need to specify a tilde and after the